Android调用WI-FI的核心代码

原创 于 2013-11-28 22:48:30 发布 · 857 阅读 · 0 ·
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本文介绍了一个Android应用的实现，该应用通过利用strings.xml、color.xml、layout文件和MainActivity.java，提供了Wi-Fi开关功能及实时状态监控。通过XML资源文件定义了各种字符串、颜色和布局，而MainActivity.java则负责与Android系统的Wi-Fi服务交互，实现Wi-Fi的开启与关闭，并显示当前状态。应用还包含了错误处理机制，确保用户操作的可靠性。

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1、strings.xml 

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Wi-Fi</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="str_checked">开启Wi-Fi</string>
    <string name="str_uncheck">关闭Wi-Fi</string>
    <string name="str_start_wifi_failed">尝试开启WIFI，服务失败</string>
    <string name="str_start_wifi_done">尝试开启WIFI，服务成功</string>
    <string name="str_stop_wifi_failed">尝试关闭WIFI，服务失败</string>
    <string name="str_stop_wifi_done">尝试开启WIFI，服务成功</string>
    <string name="str_wifi_enabling">WIFI启动过程中……</string>
    <string name="str_wifi_disabling">WIFI关闭过程中</string>
    <string name="str_wifi_disabled">WIFI已经关闭</string>
    <string name="str_wifi_unknow">WIFI未知状态……</string>

</resources>

2、values文件夹下新建一个color.xml 

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <drawable name="darkgray">#808080</drawable>
    <drawable name="white">#FFFFFF</drawable>
    <drawable name="blue">#0000FF</drawable>
    <drawable name="black">#000000</drawable>
</resources>

3、layout文件夹下的activity_main.xml 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/myTextView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" 
        android:textSize="30sp"/>

    <CheckBox
        android:id="@+id/myCheckBox1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/myTextView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="67dp"
        android:text="CheckBox" />
    
</RelativeLayout>

4、MainActivity.java 

package com.ydonghao.wi_fi;

import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

	private TextView mTextView01;
	private CheckBox mCheckBox01;
	private WifiManager mWifiManager01;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		mTextView01 = (TextView) findViewById(R.id.myTextView1);
		mCheckBox01 = (CheckBox) findViewById(R.id.myCheckBox1);
		
		mWifiManager01 = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
		
		if(mWifiManager01.isWifiEnabled()){
			if(mWifiManager01.getWifiState() == WifiManager.WIFI_STATE_ENABLED){
				mCheckBox01.setChecked(true);
				mCheckBox01.setText(R.string.str_uncheck);
			} else {
				mCheckBox01.setChecked(false);
				mCheckBox01.setText(R.string.str_checked);
			}
		} else {
			mCheckBox01.setChecked(false);
			mCheckBox01.setText(R.string.str_checked);
		}
		
		mCheckBox01.setOnClickListener(new CheckBox.OnClickListener(){

			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				if(mCheckBox01.isChecked() == false){
					try{
						if(mWifiManager01.isWifiEnabled()){
							if(mWifiManager01.setWifiEnabled(false)){
								mTextView01.setText(R.string.str_stop_wifi_done);
							}else{
								mTextView01.setText(R.string.str_stop_wifi_failed);
							}
						} else {
							switch(mWifiManager01.getWifiState()) {
							case WifiManager.WIFI_STATE_ENABLING:
								mTextView01.setText(getResources().
										getText(R.string.str_stop_wifi_failed)
										+":"+getResources().getText(R.string.str_wifi_enabling));
								break;
							case WifiManager.WIFI_STATE_DISABLING:
								mTextView01.setText(getResources().
										getText(R.string.str_stop_wifi_failed)
										+":"+getResources().getText(R.string.str_wifi_disabling));
								break;
							case WifiManager.WIFI_STATE_DISABLED:
								mTextView01.setText(getResources().
										getText(R.string.str_stop_wifi_failed)
										+":"+getResources().getText(R.string.str_wifi_disabled));
								break;
							case WifiManager.WIFI_STATE_UNKNOWN:
								default:
									mTextView01.setText(getResources().
											getText(R.string.str_stop_wifi_failed)
											+":"+getResources().getText(R.string.str_wifi_unknow));
								break;
							}
							mCheckBox01.setText(R.string.str_checked);
						}
					} catch (Exception e) {
						Log.i("HIPPO", e.toString());
						e.printStackTrace();
					}
				} else if(mCheckBox01.isChecked() == true){
					try{
						if(!mWifiManager01.isWifiEnabled() && 
								mWifiManager01.getWifiState()!=WifiManager.WIFI_STATE_ENABLING){
							if(mWifiManager01.setWifiEnabled(true)){
								switch(mWifiManager01.getWifiState()){
								case WifiManager.WIFI_STATE_ENABLING:
									mTextView01.setText(getResources().getText(R.string.str_wifi_enabling));
									break;
								case WifiManager.WIFI_STATE_ENABLED:
									mTextView01.setText(getResources().getText(R.string.str_start_wifi_done));
									break;
									default:
										mTextView01.setText(
												getResources().getText(R.string.str_start_wifi_failed)+":"+
														getResources().getText(R.string.str_wifi_unknow));
										break;
								}
							}else{
								mTextView01.setText(R.string.str_start_wifi_failed);
							}
						}else{
							switch(mWifiManager01.getWifiState()){
							case WifiManager.WIFI_STATE_ENABLING:
								mTextView01.setText(
										getResources().getText(R.string.str_start_wifi_failed)+":"+
										getResources().getText(R.string.str_wifi_enabling)
										);
								break;
							case WifiManager.WIFI_STATE_DISABLING:
								mTextView01.setText(
										getResources().getText(R.string.str_start_wifi_failed)+":"+
										getResources().getText(R.string.str_wifi_disabling)
										);
								break;
							case WifiManager.WIFI_STATE_DISABLED:
								mTextView01.setText(
										getResources().getText(R.string.str_start_wifi_failed)+":"+
										getResources().getText(R.string.str_wifi_disabled)
										);
								break;
							case WifiManager.WIFI_STATE_UNKNOWN:
								default:
								mTextView01.setText(
										getResources().getText(R.string.str_start_wifi_failed)+":"+
										getResources().getText(R.string.str_wifi_unknow)
										);
								break;
							}
						}
						mCheckBox01.setText(R.string.str_uncheck);
					}catch(Exception e){
						Log.i("Errors", e.toString());
						e.printStackTrace();
					}
				} 
			}
			
		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	public void mMakeTextToast(String str, boolean isLong){
		if(isLong == true){
			Toast.makeText(MainActivity.this, str, Toast.LENGTH_LONG).show();
		}else{
			Toast.makeText(MainActivity.this, str, Toast.LENGTH_SHORT).show();
		}
	}
	
	@Override
	protected void onResume(){
		super.onResume();
		try{
			switch(mWifiManager01.getWifiState()){
			case WifiManager.WIFI_STATE_ENABLED:
				mTextView01.setText(getResources().getText(R.string.str_wifi_enabling));
				break;
			case WifiManager.WIFI_STATE_ENABLING:
				mTextView01.setText(getResources().getText(R.string.str_wifi_enabling));
				break;
			case WifiManager.WIFI_STATE_DISABLING:
				mTextView01.setText(getResources().getText(R.string.str_wifi_disabling));
				break;
			case WifiManager.WIFI_STATE_DISABLED:
				mTextView01.setText(getResources().getText(R.string.str_wifi_disabled));
				break;
			case WifiManager.WIFI_STATE_UNKNOWN:
				default:
					mTextView01.setText(getResources().getText(R.string.str_wifi_unknow));
					break;
			}
		}catch(Exception e){
			e.getStackTrace();
		}
	}
}

5、AndroidManifest.xml的权限赋予

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ydonghao.wi_fi"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.ydonghao.wi_fi.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
</manifest>

6、文件分布






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