Android的Service使用例子:酷狗音乐中的音乐播放,电话黑名单中自动挂断电话

最新推荐文章于 2025-04-17 11:42:57 发布

ReflectMirroring

最新推荐文章于 2025-04-17 11:42:57 发布

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分类专栏： Android

本文链接：https://blog.youkuaiyun.com/qq_43416157/article/details/111173243

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酷狗音乐中的音乐播放

在Activity中实现

遇到的问题:
	播放是没什么问题,但是退出界面后再次进去就没办法控制之前播放的音乐了

<?xml version="1.0" encoding="utf-8"?>
<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:id="@+id/btn_main_play"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="play" />

    <Button
        android:id="@+id/btn_main_stop"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="stop" />

    <Button
        android:id="@+id/btn_main_pause"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="pause" />

    <Button
        android:id="@+id/btn_main_exit"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="exit" />

</LinearLayout>

package com.jane.MusicService;

import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener
{

	private Button btn_main_play;
	private Button btn_main_stop;
	private Button btn_main_pause;
	private Button btn_main_exit;

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

		btn_main_play = (Button) findViewById(R.id.btn_main_play);
		btn_main_stop = (Button) findViewById(R.id.btn_main_stop);
		btn_main_pause = (Button) findViewById(R.id.btn_main_pause);
		btn_main_exit = (Button) findViewById(R.id.btn_main_exit);

		btn_main_play.setOnClickListener(this);
		btn_main_stop.setOnClickListener(this);
		btn_main_pause.setOnClickListener(this);
		btn_main_exit.setOnClickListener(this);
	}

	@Override
	public void onClick(View v)
	{
		if (btn_main_play == v)
		{
			// 播放
			playMusic();
		} else if (btn_main_stop == v)
		{
			// 停止播放
			stopMusic();
		} else if (btn_main_pause == v)
		{
			// 暂停音乐
			pauseMusic();
		} else if (btn_main_exit == v)
		{
			// 退出并停止音乐
			exitMusic();
		}
	}

	private MediaPlayer player;

	private void exitMusic()
	{
		stopMusic();
		finish();
	}

	/*
	 * 暂停音乐
	 */
	private void pauseMusic()
	{
		if (player != null && player.isPlaying())
		{
			player.pause();
		}
	}

	private void stopMusic()
	{
		if (player != null)
		{
			player.stop();// 停止
			player.reset();// 重置
			player.release();// 释放资源
			player = null;// 赋空
		}
	}

	/**
	 * 播放音乐
	 */
	private void playMusic()
	{
		if (player == null)
		{
			player = MediaPlayer.create(this, R.raw.water_hander);
		}
		player.start();
	}
}

在Service中实现

package com.jane.MusicService;

import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener
{

	private Button btn_main_play;
	private Button btn_main_stop;
	private Button btn_main_pause;
	private Button btn_main_exit;

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

		btn_main_play = (Button) findViewById(R.id.btn_main_play);
		btn_main_stop = (Button) findViewById(R.id.btn_main_stop);
		btn_main_pause = (Button) findViewById(R.id.btn_main_pause);
		btn_main_exit = (Button) findViewById(R.id.btn_main_exit);

		btn_main_play.setOnClickListener(this);
		btn_main_stop.setOnClickListener(this);
		btn_main_pause.setOnClickListener(this);
		btn_main_exit.setOnClickListener(this);
	}

	@Override
	public void onClick(View v)
	{
		Intent intent = new Intent(this, MusicService.class);
		if (btn_main_play == v)
		{
			// 播放
			intent.putExtra("action", "play");
			startService(intent);
		} else if (btn_main_stop == v)
		{
			// 停止播放
			intent.putExtra("action", "stop");
			startService(intent);
		} else if (btn_main_pause == v)
		{
			// 暂停音乐
			intent.putExtra("action", "pause");
			startService(intent);
		} else if (btn_main_exit == v)
		{
			// 退出并停止音乐
			// 停止服务
			stopService(intent);
			finish();
		}
	}
}

package com.jane.MusicService;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;

/**
 * 播放音乐的Service
 */
public class MusicService extends Service
{

	@Override
	public IBinder onBind(Intent intent)
	{
		// TODO Auto-generated method stub
		return null;
	}

	private MediaPlayer player;

	@Override
	public int onStartCommand(Intent intent, int flags, int startId)
	{
		String action = intent.getStringExtra("action");
		if ("play".equals(action))
		{
			playMusic();
		} else if ("pause".equals(action))
		{
			pauseMusic();
		} else if ("stop".equals(action))
		{
			stopMusic();
		}

		return super.onStartCommand(intent, flags, startId);
	}

	/*
	 * 暂停音乐
	 */
	private void pauseMusic()
	{
		if (player != null && player.isPlaying())
		{
			player.pause();
		}
	}

	private void stopMusic()
	{
		if (player != null)
		{
			player.stop();// 停止
			player.reset();// 重置
			player.release();// 释放资源
			player = null;// 赋空
		}
	}
	/**
	 * 播放音乐
	 */
	private void playMusic()
	{
		if (player == null)
		{
			player = MediaPlayer.create(this, R.raw.water_hander);
		}
		player.start();
	}

	@Override
	public void onDestroy()
	{
		super.onDestroy();
		// 在销毁之前停止音乐
		stopMusic();
	}
}

电话黑名单中自动挂断电话

Android没有对外公开结束通话的API,如果需要结束通话,
必须使用AIDL与电话管理服务进行通信,
并调用服务中的API实现结束通话,步骤是:
	从sdk的源码中复制这个文件
		 com/android/internal/telephony/ITelephony.aidl

	调用ITelephony.endCall()结束通话
	
			public void endCall(View v) throws Exception
			{
				// 通过反射调用隐藏的API
				// 得到隐藏类的Class对象
				Class c = Class.forName("android.os.ServiceManager");
				// 得到方法所对应的Method对象
				Method method = c.getMethod("getService", String.class);
				// 调用方法
				IBinder iBinder = (IBinder) method.invoke(null,Context.TELEPHONY_SERVICE);
				// 得到接口对象
				ITelephony telephony = ITelephony.Stub.asInterface(iBinder);
				// 结束通话
				telephony.endCall();
			}
	
	声明打/挂断电话的权限

相关的API
TelephonyManager: 电话服务的管理器
       context.getSystemService(Context.TELEPHONY_SERVICE):得到它的对象
       listen(phoneStateListener,PhoneStateListener.LISTEN_CALL_STATE):监听电话状态: 

PhoneStateListener : 电话状态监听器
      onCallStateChanged(int state, String incomingNumber): 电话状态改变的回调方法
      电话的三种状态:
      TelephonyManager.CALL_STATE_IDLE : 空闲状态
      TelephonyManager.CALL_STATE_RINGING : 响铃状态
      TelephonyManager.CALL_STATE_OFFHOOK : 接通状态

实现

package com.jane.callservice;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity
{

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

	public void startListenCall(View v)
	{
		startService(new Intent(this, ListenCallService.class));
	}

	public void stopListenCall(View v)
	{
		stopService(new Intent(this, ListenCallService.class));
	}
}

package com.jane.callservice;

import java.lang.reflect.Method;
import com.android.internal.telephony.ITelephony;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;

public class ListenCallService extends Service
{

	private TelephonyManager tm;
	private PhoneStateListener listener = new PhoneStateListener()
	{

		/**
		 * Callback invoked when device call state changes.
		 *
		 * @see TelephonyManager#CALL_STATE_IDLE
		 * @see TelephonyManager#CALL_STATE_RINGING
		 * @see TelephonyManager#CALL_STATE_OFFHOOK
		 */
		public void onCallStateChanged(int state, String incomingNumber)
		{
			switch (state)
			{
			case TelephonyManager.CALL_STATE_IDLE:// 空闲 (挂断电话/未来电之前)
				Log.e("TAG", "空闲 (挂断电话/未来电之前)");
				break;
			case TelephonyManager.CALL_STATE_RINGING:// 响铃
				Log.e("TAG", "响铃");
				// 如果来电电话是黑名单号(110), 就挂断电话
				if ("110".equals(incomingNumber))
				{
					try
					{
						endCall();
					} catch (Exception e)
					{
						e.printStackTrace();
					}
				}
				break;
			case TelephonyManager.CALL_STATE_OFFHOOK:// 接通
				Log.e("TAG", "接通");

				break;
			default:
				break;
			}
		}
	};

	@Override
	public IBinder onBind(Intent intent)
	{
		return null;
	}

	/**
	 * 挂断电话
	 * @throws Exception 
	 */
	private void endCall() throws Exception 
	{
		// 通过反射调用隐藏的API
		// 得到隐藏类的Class对象
		Class c = Class.forName("android.os.ServiceManager");
		// 得到方法所对应的Method对象
		Method method = c.getMethod("getService", String.class);
		// 调用方法
		IBinder iBinder = (IBinder) method.invoke(null,Context.TELEPHONY_SERVICE);
		// 得到接口对象
		ITelephony telephony = ITelephony.Stub.asInterface(iBinder);
		// 结束通话
		telephony.endCall();
	}

	@Override
	public void onCreate()
	{
		super.onCreate();
		Log.e("TAG", "Service onCreate()");

		// 得到电话管理器
		tm = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
		// 监听电话状态
		tm.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);
	}

	@Override
	public void onDestroy()
	{
		super.onDestroy();
		Log.e("TAG", "Service onDestroy()");
		// 停止电话监听
		tm.listen(listener, PhoneStateListener.LISTEN_NONE);
	}
}