BroadCastReceiver运用

最新推荐文章于 2020-03-05 19:21:08 发布

原创最新推荐文章于 2020-03-05 19:21:08 发布 · 247 阅读

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CC 4.0 BY-SA版权

本博客详细介绍了安卓应用开发过程中的关键步骤，包括欢迎页面、登录注册界面的实现，以及联系人管理和拨号功能的开发。通过两个具体案例，展示了如何使用广播接收器进行组件间通信，适用于希望深入了解安卓应用开发流程和技术的读者。

广播接收运用

作业一

欢迎页面引导页

package com.example.day12_homewrok;

import android.content.Intent;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.example.day12_homewrok.Fragment.WelComeFragment;

import java.util.ArrayList;
import java.util.List;

public class WelcomeActivity extends AppCompatActivity {

    private ViewPager viewPager;
    private TextView textView_page;
    private Button button_in;
    private List<WelComeFragment> list = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_welcome);

        initData();

        initView();
    }

    private void initData() {
        for (int i = 0; i < 3; i++) {
            WelComeFragment fragment = new WelComeFragment();
            list.add(fragment);
        }

    }

    private void initView() {
        viewPager = findViewById(R.id.view_pager);
        textView_page = findViewById(R.id.text_page);
        button_in = findViewById(R.id.button_in);


        PagerAdapter();
        PageListener();
    }

    private void PageListener() {
        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int i, float v, int i1) {

            }

            @Override
            public void onPageSelected(int i) {
                if(i == list.size()-1){
                    button_in.setVisibility(View.VISIBLE);
                }else{
                    button_in.setVisibility(View.GONE);
                }
                textView_page.setText((i+1)+"/3");

            }

            @Override
            public void onPageScrollStateChanged(int i) {

            }
        });
        button_in.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(WelcomeActivity.this, MainActivity.class);
                startActivity(intent);
                finish();
            }
        });
    }

    private void PagerAdapter() {
        viewPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int i) {
                return list.get(i);
            }

            @Override
            public int getCount() {
                return list.size();
            }
        });
    }
}

登录主页面

package com.example.day12_homewrok;

import android.content.ContentResolver;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import java.util.regex.Pattern;

public class MainActivity extends AppCompatActivity {

    private EditText editLogUser;
    private EditText editLogPwd;

    //数据库操作
    private ContentResolver contentResolver;
    private Uri uri;

    //判断用户密码
    private boolean flag = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //数据库
        contentResolver = getContentResolver();
        uri = Uri.parse("content://pan.sql1");

        initView();

        //如果之前登陆过，直接跳转
        SharedPreferences one = getSharedPreferences("one", MODE_PRIVATE);
        boolean isLogin = one.getBoolean("isLogin",false);
        if(isLogin){
            Intent intent = new Intent(this, ShowActivity.class);
            startActivity(intent);
        }
    }

    private void initView() {
        editLogUser = (EditText) findViewById(R.id.edit_log_user);
        editLogPwd = (EditText) findViewById(R.id.edit_log_pwd);

    }

    public void click(View view) {
            switch (view.getId()){
                case R.id.button_login:
                    String pwd = editLogPwd.getText().toString();
                    String user = editLogUser.getText().toString();

                    //用户输入监听
                    editListener(user,pwd);

                    break;

                case R.id.button_toRe:

                    Intent intent = new Intent(this, RegisterActivity.class);
                    startActivity(intent);

                    editLogUser.setText("");
                    editLogPwd.setText("");
                    break;

            }

    }

    //查询数据库并且判断
    private void sql_query(String user, String pwd) {
        Cursor cursor = contentResolver.query(uri, null, null, null, null);
        if(cursor != null){
            while(cursor.moveToNext()){
                String old_user = cursor.getString(cursor.getColumnIndex("user"));
                String old_pwd = cursor.getString(cursor.getColumnIndex("pwd"));

                if(user.equals(old_user) && pwd.equals(old_pwd)){
                    flag = true;
                }
            }
                cursor.close();
        }

        //如果有记录-》登陆成功 否则失败
        if(flag){
            Toast.makeText(this, "登陆成功！", Toast.LENGTH_SHORT).show();
            Intent intent = new Intent(this,ShowActivity.class);

            SharedPreferences one = getSharedPreferences("one", MODE_PRIVATE);
            SharedPreferences.Editor edit = one.edit();
            edit.putBoolean("isLogin",true);
            edit.commit();

            startActivity(intent);
        }else{
            Toast.makeText(this, "密码或用户名不正确！", Toast.LENGTH_SHORT).show();
            return;
        }

    }

    private void editListener(String user, String pwd) {

        boolean mat1 = Pattern.matches( "^[0-9A-Za-z]{12,18}$",user);
        boolean mat2 = Pattern.matches( "^/w{5,11}$",pwd);

        if(!mat1){
            Toast.makeText(this, "用户名格式不正确！", Toast.LENGTH_SHORT).show();
            return;
        }
        if(!mat2){
            Toast.makeText(this, "密码格式不正确", Toast.LENGTH_SHORT).show();
            return;
        }
        if(user == null || user.equals("")){
            Toast.makeText(this, "用户名不能为空！", Toast.LENGTH_SHORT).show();
            return;
        }
        if(pwd == null || pwd.equals("")){
            Toast.makeText(this, "密码不能为空!", Toast.LENGTH_SHORT).show();
            return;
        }


        sql_query(user,pwd);



    }
}

注册主页面

package com.example.day12_homewrok;

import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.util.regex.Pattern;

public class RegisterActivity extends AppCompatActivity {
    //寻找视图
    private EditText editUser;
    private EditText editPwd;
    private EditText editRePwd;
    private Button button_select;
    //数据库操作
    private ContentResolver contentResolver;
    private Uri uri;

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

        contentResolver = getContentResolver();
        uri = Uri.parse("content://pan.sql1");

        initView();
    }

    private void initView() {
        editUser = (EditText) findViewById(R.id.edit_user);
        editPwd = (EditText) findViewById(R.id.edit_pwd);
        editRePwd = (EditText) findViewById(R.id.edit_rePwd);
        button_select = findViewById(R.id.button_select);

        button_select.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Cursor cursor = contentResolver.query(uri, null, null, null, null);
                if(cursor != null){
                    while(cursor.moveToNext()){
                        String user = cursor.getString(cursor.getColumnIndex("user"));
                        String pwd = cursor.getString(cursor.getColumnIndex("pwd"));

                        Toast.makeText(RegisterActivity.this, user+"-"+pwd, Toast.LENGTH_SHORT).show();
                    }
                    cursor.close();
                }
            }
        });
    }

    public void click(View view) {

        String user = editUser.getText().toString();
        String pwd = editPwd.getText().toString();
        String rePwd = editRePwd.getText().toString();

        editListener(user,pwd,rePwd);

    }

    private void editListener(String user, String pwd, String rePwd) {

        boolean mat1 = Pattern.matches( "^[0-9A-Za-z]{12,18}$",user);
        boolean mat2 = Pattern.matches( "^/w{12,18}$",pwd);

        Toast.makeText(this, mat1+"-"+mat2, Toast.LENGTH_SHORT).show();

        if(!mat1){
            Toast.makeText(this, "用户名格式不正确！", Toast.LENGTH_SHORT).show();
            return;
        }
        if(!mat2){
            Toast.makeText(this, "密码格式不正确！", Toast.LENGTH_SHORT).show();
            return;
        }
        if(user.equals("") || user == null){
            Toast.makeText(this, "用户名不能为空！", Toast.LENGTH_SHORT).show();
            return;
        }
        if(pwd.equals("") || pwd == null){
            Toast.makeText(this, "密码不能为空！", Toast.LENGTH_SHORT).show();
            return;
        }
//        Toast.makeText(this, pwd+"-"+rePwd, Toast.LENGTH_SHORT).show();
        if(!(pwd.equals(rePwd))){
            Toast.makeText(this, "两次密码输入不正确", Toast.LENGTH_SHORT).show();
            return;
        }
        getInSql(user,pwd);

    }
    //数据库
    private void getInSql(String user, String pwd) {

        ContentValues values = new ContentValues();
        values.put("user",user);
        values.put("pwd",pwd);
        getContentResolver().insert(uri,values);

        Toast.makeText(this, "注册成功！", Toast.LENGTH_SHORT).show();

        Intent intent = new Intent(RegisterActivity.this, MainActivity.class);
        startActivity(intent);
        finish();
    }
}

联系人以及拨号页面

package com.example.day12_homewrok;

import android.Manifest;
import android.content.ContentResolver;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.provider.ContactsContract;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ShowActivity extends AppCompatActivity {

    private ListView listView;
    private ContentResolver contentResolver;

    //数据源
    private List<Map<String,Object>> telList = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_show);

        listView = findViewById(R.id.list_view);

        requestPermissions(new String[]{Manifest.permission.READ_CONTACTS,Manifest.permission.WRITE_CONTACTS},100);

       contentResolver = getContentResolver();

       initView();

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if(requestCode == 100 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
            initData();
        }
    }

    private void initData() {

        Cursor cursor = contentResolver.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
        if(cursor != null){
            while(cursor.moveToNext()){
                String name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                String number = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

                Map<String,Object> map = new HashMap<>();
                map.put("name",name);
                map.put("tel",number);

                telList.add(map);
            }
            cursor.close();
        }
        listView.setAdapter(new MyAdapter());
    }

    private void initView() {
        //为listView 设置适配器
        listViewEntity();
    }

    private void listViewEntity() {

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + telList.get(position).get("tel").toString()));
                startActivity(intent);

            }
        });
    }

    private class MyAdapter extends BaseAdapter {
        @Override
        public int getCount() {
            return telList.size();
        }

        @Override
        public Object getItem(int position) {
            return telList.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder = null;
            if(convertView ==  null){
                holder = new ViewHolder();
                convertView = getLayoutInflater().inflate(R.layout.layout_telephony,null);

                holder.textView_name = convertView.findViewById(R.id.text_name);
                holder.textView_tel = convertView.findViewById(R.id.text_tel);

                convertView.setTag(holder);
            }else{
                holder = (ViewHolder) convertView.getTag();
            }

            holder.textView_name.setText(telList.get(position).get("name").toString());
            holder.textView_tel.setText(telList.get(position).get("tel").toString());

            return convertView;
        }

        class ViewHolder{
            TextView textView_name;
            TextView textView_tel;

        }
    }
}

作业二 2个案例

第一个案例

mainActivity

package com.example.app2;

import android.content.Intent;
import android.content.IntentFilter;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import com.example.app2.MyReceivers.MyFReceiver;

public class MainActivity extends AppCompatActivity {
    private Button buttonSend;

    private LocalBroadcastManager manager;
    private MyFReceiver myFReceiver;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        buttonSend = (Button) findViewById(R.id.button_send);

        manager = LocalBroadcastManager.getInstance(this);

        myFReceiver = new MyFReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction("com.pan.re");

        manager.registerReceiver(myFReceiver,filter);
    }

    public void click(View view) {
        Intent intent = new Intent();
        intent.setAction("com.pan.re");

        manager.sendBroadcast(intent);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        manager.unregisterReceiver(myFReceiver);
    }
}

广播接收者

package com.example.app2.MyReceivers;

import android.app.Notification;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

import com.example.app2.R;

public class MyFReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        Notification.Builder builder = new Notification.Builder(context);

        builder.setSmallIcon(R.mipmap.ic_launcher);
        builder.setContentText("我是动态广播哒！");
        builder.setContentTitle("系统提示");

        builder.setPriority(Notification.PRIORITY_MAX);
        builder.setDefaults(Notification.DEFAULT_ALL);

        NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

        manager.notify(1,builder.build());
    }
}

第一个案例的布局xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:onClick="click"
        android:id="@+id/button_send"
        android:text="广播"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

第二个案例

package com.example.app2;

import android.content.Intent;
import android.content.IntentFilter;
import android.os.Handler;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

import com.example.app2.MyReceivers.MySReceiver;

public class Main2Activity extends AppCompatActivity {

    private ImageView imageView;
    private MySReceiver mySReceiver;

    private Handler handler = new Handler();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        imageView = findViewById(R.id.image_id);


        mySReceiver = new MySReceiver(handler,imageView);
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("xxx.pan");

        registerReceiver(mySReceiver,intentFilter);

    }

    public void click(View view) {
        Intent intent = new Intent();
        intent.setAction("xxx.pan");

        sendBroadcast(intent);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mySReceiver);
    }
}

第二个案例

第二个Activity

package com.example.app2;

import android.content.Intent;
import android.content.IntentFilter;
import android.os.Handler;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

import com.example.app2.MyReceivers.MySReceiver;

public class Main2Activity extends AppCompatActivity {

    private ImageView imageView;
    private MySReceiver mySReceiver;

    private Handler handler = new Handler();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        imageView = findViewById(R.id.image_id);


        mySReceiver = new MySReceiver(handler,imageView);
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("xxx.pan");

        registerReceiver(mySReceiver,intentFilter);

    }

    public void click(View view) {
        Intent intent = new Intent();
        intent.setAction("xxx.pan");

        sendBroadcast(intent);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mySReceiver);
    }
}

第二个案例的广播接收者

package com.example.app2.MyReceivers;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.widget.ImageView;

import com.example.app2.R;


public class MySReceiver extends BroadcastReceiver {

    private Handler handler;
    private ImageView imageView;

    public MySReceiver(Handler handler, ImageView imageView) {
        super();
        this.handler = handler;
        this.imageView = imageView;
    }

    @Override
    public void onReceive(Context context, Intent intent) {

        if(intent.getAction().equals("xxx.pan")) {
            handler.post(new Runnable() {
                @Override
                public void run() {
                    imageView.setImageResource(R.mipmap.youyou);
                }
            });
        }

    }
}

第二个案例布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Main2Activity">

    <Button
        android:text="更新图片"
        android:id="@+id/button_send2"
        android:onClick="click"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <ImageView
        android:layout_centerInParent="true"
        android:id="@+id/image_id"
        android:src="@mipmap/ic_launcher"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>