Android学习之数据存储

Android数据存储

1. 主界面XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="数据存储方式"
        android:textColor="#ff0000"
        android:textSize="20sp" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onClickSP"
        android:text="SharedPreference存储" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onClickIF"
        android:text="内部文件存储" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onClickOF"
        android:text="外部文件存储" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onClickDB"
        android:text="数据库存储" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="onClickNW"
        android:text="网络存储存储" />

</LinearLayout>

1.1 主界面Activity

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	// 测试sp存储
	public void onClickSP(View v) {
		startActivity(new Intent(this, SpActivity.class));
	}

	// 测试手机内部文件存储
	public void onClickIF(View v) {
		startActivity(new Intent(this, IFActivity.class));
	}

	// 测试手机外部文件存储
	public void onClickOF(View v) {
		startActivity(new Intent(this, OFActivity.class));
	}

	// 测试Sqlite数据库存储
	public void onClickDB(View v) {
		startActivity(new Intent(this, DBActivity.class));
	}

	public void onClickNW(View v) {
		startActivity(new Intent(this, NetworkActivity.class));
	}
}

2. sp存储XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/et_sp_key"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="存储的key" />

    <EditText
        android:id="@+id/et_sp_value"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="存储的value" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="save"
            android:text="保 存" />
        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="read"
            android:text="读 取" />
    </LinearLayout>

</LinearLayout>

2.2 sp存储Activity

/**
 * 测试sp存储的界面
 */
public class SpActivity extends Activity {

	private EditText et_sp_key;
	private EditText et_sp_value;
	
	private SharedPreferences sp;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_sp);
		
		et_sp_key = (EditText) findViewById(R.id.et_sp_key);
		et_sp_value = (EditText) findViewById(R.id.et_sp_value);
		
		//1. 得到sp对象
		sp = getSharedPreferences("atguigu", Context.MODE_PRIVATE);
	}
	
	public void save(View v) {
		//2. 得到editor对象
		Editor edit = sp.edit();
		//3. 得到输入的key/value
		String key = et_sp_key.getText().toString();
		String value = et_sp_value.getText().toString();
		//4. 使用editor保存key-value
		edit.putString(key, value).commit();
		//5. 提示
		Toast.makeText(this, "保存完成!", 0).show();
	}
	
	public void read(View v) {
		//1. 得到输入的key
		String key = et_sp_key.getText().toString();
		//2. 根据key读取对应的value
		String value = sp.getString(key, null);
		//3. 显示
		if(value==null) {
			Toast.makeText(this, "没有找到对应的value", 0).show();
		} else {
			et_sp_value.setText(value);
		}
	}
}

3. 手机内部文件存储XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:text="1. 将asserts下的logo.png保存到手机内部\n2. 读取手机内部图片文件显示"
        android:textColor="#ff0000"
        android:textSize="15sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <Button
            android:id="@+id/btn_if_save"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="save"
            android:text="保 存" />

        <Button
            android:id="@+id/btn_if_read"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="read"
            android:text="读 取" />
    </LinearLayout>

    <ImageView
        android:id="@+id/iv_if"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

</LinearLayout>

3.2 手机内部文件存储Activity

public class IFActivity extends Activity {

	private ImageView iv_if;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_if);

		iv_if = (ImageView) findViewById(R.id.iv_if);
	}

	public void save(View v) throws IOException {
		//1. 得到InputStream-->读取assets下的logo.png
			//得到AssetManager 
		AssetManager manager = getAssets();
			//读取文件
		InputStream is = manager.open("logo.png");
		//2. 得到OutputStream-->/data/data/packageName/files/logo.png
		FileOutputStream fos = openFileOutput("logo.png", Context.MODE_PRIVATE);
		//3. 边读边写
		byte[] buffer = new byte[1024];
		int len = -1;
		while((len=is.read(buffer))!=-1) {
			fos.write(buffer, 0, len);
		}
		fos.close();
		is.close();
		//4. 提示
		Toast.makeText(this, "保存完成", 0).show();
	}

	public void read(View v) {// /data/data/packageName/files/logo.png
		//1. 得到图片文件的路径
			// /data/data/packageName/files
		String filesPath = getFilesDir().getAbsolutePath();
		String imagePath = filesPath+"/logo.png";
		//2. 读取加载图片文件得到bitmap对象
		Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
		//3. 将其设置到imageView中显示
		iv_if.setImageBitmap(bitmap);
	}
}

4. 手机外部文件存储XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/et_of_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="存储的文件名" />

    <EditText
        android:id="@+id/et_of_content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="存储的文件内容" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="save"
            android:text="保 存" />
        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="read"
            android:text="读 取" />
    </LinearLayout>
    
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="save2"
            android:text="保 存2" />
        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="read2"
            android:text="读 取2" />
    </LinearLayout>

</LinearLayout>

4.2 手机外部文件存储Activity

public class OFActivity extends Activity {

	private EditText et_of_name;
	private EditText et_of_content;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_of);
		
		et_of_name = (EditText) findViewById(R.id.et_of_name);
		et_of_content = (EditText) findViewById(R.id.et_of_content);
	}

	public void save(View v) throws IOException {
		//1. 判断sd卡状态, 如果是挂载的状态才继续, 否则提示
		if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
			//2. 读取输入的文件名/内容
			String fileName = et_of_name.getText().toString();
			String content = et_of_content.getText().toString();
			//3. 得到指定文件的OutputStream
				//1).得到sd卡下的files路径
			String filesPath = getExternalFilesDir(null).getAbsolutePath();
				//2).组成完整路径
			String filePath = filesPath+"/"+fileName;
				//3). 创建FileOutputStream
			FileOutputStream fos = new FileOutputStream(filePath);
			//4. 写数据 
			fos.write(content.getBytes("utf-8"));
			fos.close();
			//5. 提示
			Toast.makeText(this, "保存完成", 0).show();
		} else {
			Toast.makeText(this, "sd卡没有挂载", 0).show();
		}
		
	}

	public void read(View v) throws Exception {
		
		// 1. 判断sd卡状态, 如果是挂载的状态才继续, 否则提示
		if (Environment.getExternalStorageState().equals(
				Environment.MEDIA_MOUNTED)) {
			// 2. 读取输入的文件名
			String fileName = et_of_name.getText().toString();
			// 3. 得到指定文件的InputStream
				// 1).得到sd卡下的files路径
			String filesPath = getExternalFilesDir(null).getAbsolutePath();
				// 2).组成完整路径
			String filePath = filesPath + "/" + fileName;
				// 3). 创建FileInputStream
			FileInputStream fis = new FileInputStream(filePath);
			// 4. 读取数据, 成String
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			byte[] buffer = new byte[1024];
			int len = -1;
			while((len=fis.read(buffer))!=-1) {
				baos.write(buffer, 0, len);
			}
			String content = baos.toString();
			
			// 5. 显示
			et_of_content.setText(content);
		} else {
			Toast.makeText(this, "sd卡没有挂载", 0).show();
		}
	}

	//  /storage/sdcard/atguigu/xxx.txt
	public void save2(View v) throws IOException {
		//1. 判断sd卡状态, 如果是挂载的状态才继续, 否则提示
		if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
			//2. 读取输入的文件名/内容
			String fileName = et_of_name.getText().toString();
			String content = et_of_content.getText().toString();
			//3. 得到指定文件的OutputStream
				//1). /storage/sdcard/
			String sdPath = Environment.getExternalStorageDirectory().getAbsolutePath();
				//2). /storage/sdcard/atguigu/(创建文件夹)
			File file = new File(sdPath+"/atguigu");
			if(!file.exists()) {
				file.mkdirs();//创建文件夹
			}
				//3). /storage/sdcard/atguigu/xxx.txt
			String filePath = sdPath+"/atguigu/"+fileName;
				//4). 创建输出流
			FileOutputStream fos = new FileOutputStream(filePath);
			//4. 写数据 
			fos.write(content.getBytes("utf-8"));
			fos.close();
			//5. 提示
			Toast.makeText(this, "保存完成", 0).show();
		} else {
			Toast.makeText(this, "sd卡没有挂载", 0).show();
		}
	}

	public void read2(View v) throws Exception {
		// 1. 判断sd卡状态, 如果是挂载的状态才继续, 否则提示
		if (Environment.getExternalStorageState().equals(
				Environment.MEDIA_MOUNTED)) {
			// 2. 读取输入的文件名
			String fileName = et_of_name.getText().toString();
			// 3. 得到指定文件的InputStream
			String sdPath = Environment.getExternalStorageDirectory().getAbsolutePath();
			String filePath = sdPath+"/atguigu/"+fileName;
			FileInputStream fis = new FileInputStream(filePath);
			// 4. 读取数据, 成String
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			byte[] buffer = new byte[1024];
			int len = -1;
			while((len=fis.read(buffer))!=-1) {
				baos.write(buffer, 0, len);
			}
			String content = baos.toString();
			fis.close();
			// 5. 显示
			et_of_content.setText(content);
		} else {
			Toast.makeText(this, "sd卡没有挂载", 0).show();
		}
	}
}

5. sqlite数据库存储XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="testCreateDB"
        android:text="Create DB" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="testUpdateDB"
        android:text="Update DB" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="testInsert"
        android:text="Insert" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="testUpdate"
        android:text="Update" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="testDelete"
        android:text="Delete" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="testQuery"
        android:text="query" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="testTransaction"
        android:text="Test Transaction" />

</LinearLayout>

5.2 sqlite数据库存储Activity

public class DBActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_db);
	}

	/*
	 * 创建库
	 */
	public void testCreateDB(View v) {
		DBHelper dbHelper = new DBHelper(this, 1);
		//获取连接
		SQLiteDatabase database = dbHelper.getReadableDatabase();
		
		Toast.makeText(this, "创建数据库", 0).show();
	}

	/*
	 * 更新库
	 */
	public void testUpdateDB(View v) {
		DBHelper dbHelper = new DBHelper(this, 2);
		//获取连接
		SQLiteDatabase database = dbHelper.getReadableDatabase();
		
		Toast.makeText(this, "更新数据库", 0).show();
	}

	/*
	 * 添加记录
	 */
	public void testInsert(View v) {
		//1. 得到连接
		DBHelper dbHelper = new DBHelper(this, 2);
		SQLiteDatabase database = dbHelper.getReadableDatabase();
		//2. 执行insert  insert into person(name, age) values('Tom', 12)
		ContentValues values = new ContentValues();
		values.put("name", "Tom");
		values.put("age", 12);
		long id = database.insert("person", null, values);
		//3. 关闭
		database.close();
		//4. 提示
		Toast.makeText(this, "id="+id, 1).show();
	}

	/*
	 * 更新
	 */
	public void testUpdate(View v) {
		DBHelper dbHelper = new DBHelper(this, 2);
		SQLiteDatabase database = dbHelper.getReadableDatabase();
		//执行update  update person set name=Jack, age=13 where _id=4
		ContentValues values = new ContentValues();
		values.put("name", "jack");
		values.put("age", 13);
		int updateCount = database.update("person", values , "_id=?", new String[]{"4"});
		database.close();
		Toast.makeText(this, "updateCount="+updateCount, 1).show();
	}

	/*
	 * 删除
	 */
	public void testDelete(View v) {
		// 1. 得到连接
		DBHelper dbHelper = new DBHelper(this, 2);
		SQLiteDatabase database = dbHelper.getReadableDatabase();
		// 2. 执行delete delete from person where _id=2
		int deleteCount = database.delete("person", "_id=2", null);
		// 3. 关闭
		database.close();
		// 4. 提示
		Toast.makeText(this, "deleteCount=" + deleteCount, 1).show();
	}

	/*
	 * 查询
	 */
	public void testQuery(View v) {
		// 1. 得到连接
		DBHelper dbHelper = new DBHelper(this, 2);
		SQLiteDatabase database = dbHelper.getReadableDatabase();
		// 2. 执行query select * from person
		Cursor cursor = database.query("person", null, null, null, null, null, null);
		//cursor = database.query("person", null, "_id=?", new String[]{"3"}, null, null, null);
		//得到匹配的总记录数
		int count = cursor.getCount();
		
		//取出cursor中所有的数据
		while(cursor.moveToNext()) {
			//_id
			int id = cursor.getInt(0);
			//name
			String name = cursor.getString(1);
			//age
			int age = cursor.getInt(cursor.getColumnIndex("age"));
			Log.e("TAG", id+"-"+name+"-"+age);
		}
		// 3. 关闭
		cursor.close();
		database.close();
		// 4. 提示
		Toast.makeText(this, "count=" + count, 1).show();
	}

	/*
	 * 测试事务处理
	 * update person set age=16 where _id=1
	 * update person set age=17 where _id=3
	 * 
	 * 一个功能中对数据库进行的多个操作: 要就是都成功要就都失败
	 * 事务处理的3步:
	 * 1. 开启事务(获取连接后)
	 * 2. 设置事务成功(在全部正常执行完后)
	 * 3. 结束事务(finally中)
	 */
	public void testTransaction(View v) {
		
		SQLiteDatabase database = null;
		try{
			DBHelper dbHelper = new DBHelper(this, 2);
			database = dbHelper.getReadableDatabase();
			
			//1. 开启事务(获取连接后)
			database.beginTransaction();
			
			//执行update  update person set age=16 where _id=1
			ContentValues values = new ContentValues();
			values.put("age", 16);
			int updateCount = database.update("person", values , "_id=?", new String[]{"1"});
			Log.e("TAG", "updateCount="+updateCount);
			
			//出了异常
			boolean flag = true;
			if(flag) {
				throw new RuntimeException("出异常啦!!!");
			}
			
			//执行update  update person set age=17 where _id=3
			values = new ContentValues();
			values.put("age", 17);
			int updateCount2 = database.update("person", values , "_id=?", new String[]{"3"});
			Log.e("TAG", "updateCount2="+updateCount2);
			
			//2. 设置事务成功(在全部正常执行完后)
			database.setTransactionSuccessful();
			
		} catch(Exception e) {
			e.printStackTrace();
			Toast.makeText(this, "出异常啦!!!", 1).show();
		} finally {
			//3. 结束事务(finally中)
			if(database!=null) {
				database.endTransaction();
				database.close();
			}
		}
		
	}

}

5.3 数据库连接类

public class DBHelper extends SQLiteOpenHelper {

	public DBHelper(Context context,int version) {
		super(context, "atguigu.db", null, version);
	}

	/**
	 * 什么时候才会创建数据库文件?
	 * 	1). 数据库文件不存在
	 *  2). 连接数据库
	 * 
	 * 什么时候调用?
	 * 	当数据库文件创建时调用(1次)
	 * 在此方法中做什么?
	 * 	建表
	 * 	插入一些初始化数据
	 */
	@Override
	public void onCreate(SQLiteDatabase db) {
		Log.e("TAG", "DBHelper onCreate()");
		//建表
		String sql = "create table person(_id integer primary key autoincrement, name varchar,age int)";
		db.execSQL(sql);
		//插入一些初始化数据
		db.execSQL("insert into person (name, age) values ('Tom1', 11)");
		db.execSQL("insert into person (name, age) values ('Tom2', 12)");
		db.execSQL("insert into person (name, age) values ('Tom3', 13)");
	}

	//当传入的版本号大于数据库的版本号时调用
	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		Log.e("TAG", "DBHelper onUpgrade()");
	}

}

6. 远程服务器存储XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/et_network_url"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textUri"
        android:text="@string/url" >
    </EditText>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:text="1. 测试HttpUrlConnection"
        android:textSize="20dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="testConnectionGet"
            android:text="GET请求" />

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="testConnectionPost"
            android:text="POST请求" />
    </LinearLayout>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:text="2. 测试HttpClient"
        android:textSize="20dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="testClientGet"
            android:text="GET请求" />

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="testClientPost"
            android:text="POST请求" />
    </LinearLayout>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:text="3. 测试Volley框架"
        android:textSize="20dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="testVolleyGet"
            android:text="GET请求" />

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="testVolleyPost"
            android:text="POST请求" />
    </LinearLayout>

    <EditText
        android:id="@+id/et_network_result"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:hint="用来显示网络请求返回的结果数据" >
    </EditText>

</LinearLayout>

6.2 远程服务器存储Activity

public class NetworkActivity extends Activity {

	private EditText et_network_url;
	private EditText et_network_result;
	private RequestQueue queue;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_network);
		
		et_network_url = (EditText) findViewById(R.id.et_network_url);
		et_network_result = (EditText) findViewById(R.id.et_network_result);
		
		queue = Volley.newRequestQueue(this);
	}

	/*
	 * 使用httpUrlConnection提交get请求
	 */
	/*
		1. 显示ProgressDialog
		2. 启动分线程
		3. 在分线程, 发送请求, 得到响应数据
			1). 得到path, 并带上参数name=Tom1&age=11
			2). 创建URL对象
			3). 打开连接, 得到HttpURLConnection对象
			4). 设置请求方式,连接超时, 读取数据超时
			5). 连接服务器
			6). 发请求, 得到响应数据
				得到响应码, 必须是200才读取
				得到InputStream, 并读取成String
			7). 断开连接
		4. 在主线程, 显示得到的结果, 移除dialog
	 */
	public void testConnectionGet(View v) {
		//1. 显示ProgressDialog
		final ProgressDialog dialog = ProgressDialog.show(this, null, "正在请求中...");
		//2. 启动分线程
		new Thread(){
			//3. 在分线程, 发送请求, 得到响应数据
			public void run() {
				try {
					//1). 得到path, 并带上参数name=Tom1&age=11
					String path = et_network_url.getText().toString()+"?name=Tom1&age=11";
					//2). 创建URL对象
					URL url = new URL(path);
					//3). 打开连接, 得到HttpURLConnection对象
					HttpURLConnection connection = (HttpURLConnection) url.openConnection();
					//4). 设置请求方式,连接超时, 读取数据超时
					connection.setRequestMethod("GET");
					connection.setConnectTimeout(5000);
					connection.setReadTimeout(6000);
					//5). 连接服务器
					connection.connect();
					//6). 发请求, 得到响应数据
						//得到响应码, 必须是200才读取
					int responseCode = connection.getResponseCode();
					if(responseCode==200) {
						//得到InputStream, 并读取成String
						InputStream is = connection.getInputStream();
						ByteArrayOutputStream baos = new ByteArrayOutputStream();
						byte[] buffer = new byte[1024];
						int len = -1;
						while((len=is.read(buffer))!=-1) {
							baos.write(buffer, 0, len);
						}
						final String result = baos.toString();
						
						baos.close();
						is.close();
						
						//4. 在主线程, 显示得到的结果, 移除dialog
						runOnUiThread(new Runnable() {
							@Override
							public void run() {
								et_network_result.setText(result);
								dialog.dismiss();
							}
						});
					}
					//7). 断开连接
					connection.disconnect();
				} catch (Exception e) {
					e.printStackTrace();
					//如果出了异常要移除dialog
					dialog.dismiss();
				}
			}
		}.start();
	}

	/*
	 * 使用httpUrlConnection提交post请求
	 */
	/*
		1. 显示ProgressDialog
		2. 启动分线程
		3. 在分线程, 发送请求, 得到响应数据
			1). 得到path
			2). 创建URL对象
			3). 打开连接, 得到HttpURLConnection对象
			4). 设置请求方式,连接超时, 读取数据超时
			5). 连接服务器
			6). 发请求, 得到响应数据
				得到输出流, 写请求体:name=Tom1&age=11
				得到响应码, 必须是200才读取
				得到InputStream, 并读取成String
			7). 断开连接
		4. 在主线程, 显示得到的结果, 移除dialog
	 */
	public void testConnectionPost(View v) {
		//1. 显示ProgressDialog
		final ProgressDialog dialog = ProgressDialog.show(this, null, "正在加载中...");
		//2. 启动分线程
		new Thread(new Runnable() {
			//3. 在分线程, 发送请求, 得到响应数据
			@Override
			public void run() {
				try {
					//1). 得到path
					String path = et_network_url.getText().toString();
					//2). 创建URL对象
					URL url = new URL(path);
					//3). 打开连接, 得到HttpURLConnection对象
					HttpURLConnection connection = (HttpURLConnection) url.openConnection();
					//4). 设置请求方式,连接超时, 读取数据超时
					connection.setRequestMethod("POST");
					connection.setConnectTimeout(5000);
					connection.setReadTimeout(5000);
					//5). 连接服务器
					connection.connect();
					//6). 发请求, 得到响应数据
						//得到输出流, 写请求体:name=Tom1&age=11
					OutputStream os = connection.getOutputStream();
					String data = "name=Tom2&age=12";
					os.write(data.getBytes("utf-8"));
						//得到响应码, 必须是200才读取
					int responseCode = connection.getResponseCode();
					if(responseCode==200) {
						//得到InputStream, 并读取成String
						InputStream is = connection.getInputStream();
						ByteArrayOutputStream baos = new ByteArrayOutputStream();
						byte[] buffer = new byte[1024];
						int len = -1;
						while((len=is.read(buffer))!=-1) {
							baos.write(buffer, 0, len);
						}
						final String result = baos.toString();
						
						baos.close();
						is.close();
						
						//4. 在主线程, 显示得到的结果, 移除dialog
						runOnUiThread(new Runnable() {
							@Override
							public void run() {
								et_network_result.setText(result);
								dialog.dismiss();
							}
						});
					}
					os.close();
					//7). 断开连接
					connection.disconnect();
				} catch (Exception e) {
					e.printStackTrace();
					dialog.dismiss();
				}
			}
		}).start();
	}

	/*
	 * 使用httpClient提交get请求
	 */
	public void testClientGet(View v) {
		//1. 显示ProgressDialog
		final ProgressDialog dialog = ProgressDialog.show(this, null, "正在请求中...");
		//2. 启动分线程
		new Thread(){
			//3. 在分线程, 发送请求, 得到响应数据
			public void run() {
				try {
					//1). 得到path, 并带上参数name=Tom1&age=11
					String path = et_network_url.getText().toString()+"?name=Tom3&age=13";
					
					//2). 创建HttpClient对象
					HttpClient httpClient = new DefaultHttpClient();
					//3). 设置超时
					HttpParams params = httpClient.getParams();
					HttpConnectionParams.setConnectionTimeout(params, 5000);
					HttpConnectionParams.setSoTimeout(params, 5000);
					//4). 创建请求对象
					HttpGet request = new HttpGet(path);
					//5). 执行请求对象, 得到响应对象
					HttpResponse response = httpClient.execute(request);
					
					int statusCode = response.getStatusLine().getStatusCode();
					if(statusCode==200) {
						//6). 得到响应体文本
						HttpEntity entity = response.getEntity();
						final String result = EntityUtils.toString(entity);
						//4. 要主线程, 显示数据, 移除dialog
						runOnUiThread(new Runnable() {
							@Override
							public void run() {
								et_network_result.setText(result);
								dialog.dismiss();
							}
						});
					}
					//7). 断开连接
					httpClient.getConnectionManager().shutdown();
				} catch (Exception e) {
					e.printStackTrace();
					//如果出了异常要移除dialog
					dialog.dismiss();
				}
			}
		}.start();
	}

	/*
	 * 使用httpClient提交post请求
	 */
	public void testClientPost(View v) {
		//1. 显示ProgressDialog
		final ProgressDialog dialog = ProgressDialog.show(this, null, "正在请求中...");
		//2. 启动分线程
		new Thread(){
			//3. 在分线程, 发送请求, 得到响应数据
			public void run() {
				try {
					//1). 得到path
					String path = et_network_url.getText().toString();
					
					//2). 创建HttpClient对象
					HttpClient httpClient = new DefaultHttpClient();
					//3). 设置超时
					HttpParams params = httpClient.getParams();
					HttpConnectionParams.setConnectionTimeout(params, 5000);
					HttpConnectionParams.setSoTimeout(params, 5000);
					//4). 创建请求对象
					HttpPost request = new HttpPost(path);
					//设置请求体
					List<BasicNameValuePair> parameters = new ArrayList<BasicNameValuePair>();
					parameters.add(new BasicNameValuePair("name", "Tom4"));
					parameters.add(new BasicNameValuePair("age", "14"));
					HttpEntity entity = new UrlEncodedFormEntity(parameters);
					request.setEntity(entity);
					
					//5). 执行请求对象, 得到响应对象
					HttpResponse response = httpClient.execute(request);
					
					int statusCode = response.getStatusLine().getStatusCode();
					if(statusCode==200) {
						//6). 得到响应体文本
						entity = response.getEntity();
						final String result = EntityUtils.toString(entity);
						//4. 要主线程, 显示数据, 移除dialog
						runOnUiThread(new Runnable() {
							@Override
							public void run() {
								et_network_result.setText(result);
								dialog.dismiss();
							}
						});
					}
					//7). 断开连接
					httpClient.getConnectionManager().shutdown();
				} catch (Exception e) {
					e.printStackTrace();
					//如果出了异常要移除dialog
					dialog.dismiss();
				}
			}
		}.start();
	}

	/*
	 * 使用Volley提交get请求
	 */
	/*
	 1. 创建请求队列对象(一次)
	 2. 创建请求对象StringRequest
	 3. 将请求添加到队列中
	 */
	public void testVolleyGet(View v) {
		
		final ProgressDialog dialog = ProgressDialog.show(this, null, "正在请求中...");
		
		//创建请求对象StringRequest
		String path = et_network_url.getText().toString()+"?name=Tom5&age=15";
		StringRequest request = new StringRequest(path, new Response.Listener<String>() {
			@Override
			public void onResponse(String response) {//在主线程执行
				et_network_result.setText(response);
				dialog.dismiss();
			}
		}, null);
		//将请求添加到队列中
		queue.add(request);
	}

	/*
	 * 使用Volley提交post请求
	 */
	public void testVolleyPost(View v) {
		final ProgressDialog dialog = ProgressDialog.show(this, null, "正在请求中...");
		
		//创建请求对象StringRequest
		String path = et_network_url.getText().toString();
		StringRequest request = new StringRequest(Method.POST, path, new Response.Listener<String>() {
			@Override
			public void onResponse(String response) {
				et_network_result.setText(response);
				dialog.dismiss();
			}
		}, null){
			//重写此方法返回参数的map作为请求体
			@Override
			protected Map<String, String> getParams() throws AuthFailureError {
				Map<String, String> map = new HashMap<String, String>();
				map.put("name", "Tom6");
				map.put("age", "16");
				return map;
			}
		};
		//将请求添加到队列中
		queue.add(request);
	}

}

7.AndroidManifest.xml

    <!-- 操作sd卡 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <!-- 联网 -->
    <uses-permission android:name="android.permission.INTERNET"/>