Android基于AudioManager、PhoneStateListener实现设置黑名单功能

import android.app.Activity;
import android.content.Context;
import android.media.AudioManager;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class A11Activity extends Activity {
 private EditText et;//添加输入框，输入并设置黑名单
 private TextView tv01,tv02; //tv01用来显示EditText中输入的黑名单;tv02用来显示当前手机电话所处的状态
  /** Called when the activity is first created. */
  @SuppressWarnings("static-access")
 @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    tv01=(TextView)findViewById(R.id.tv01);
    tv02=(TextView)findViewById(R.id.tv02);
    et=(EditText)findViewById(R.id.et);
    /**创建PhoneCallListener的对象；其中PhoneCallListener是
     * 扩展了PhoneStateListener的类*/
    PhoneCallListener pcl=new PhoneCallListener();
    TelephonyManager tm=(TelephonyManager)getSystemService(TELEPHONY_SERVICE);
    //设置监听电话的功能
    tm.listen(pcl, pcl.LISTEN_CALL_STATE);
  }
  public class PhoneCallListener extends PhoneStateListener{
   public void onCallStateChanged(int state,String incomingNumber){
   switch(state){
   //手机状态为待机时，手机铃声为正常模式
   case TelephonyManager.CALL_STATE_IDLE:
    tv02.setText("CALL_STATE_IDLE");
    AudioManager am=(AudioManager)getSystemService(Context.AUDIO_SERVICE);
    am.setMode(AudioManager.MODE_NORMAL);
    am.getStreamVolume(AudioManager.STREAM_RING);
    break;
    //手机状态为通话中
   case TelephonyManager.CALL_STATE_OFFHOOK:
    tv02.setText("CALL_STATE_OFFHOOK");
    break;
    //手机模式为响铃时
   case TelephonyManager.CALL_STATE_RINGING:
    tv02.setText("CALL_STATE_RINGING");
    //当来电号码与黑名单中的电话号码相同时，设置电话铃声为静音
    if(incomingNumber.equals(tv01.getText().toString())){
    AudioManager am01=(AudioManager)getSystemService(AUDIO_SERVICE);
    am01.setRingerMode(AudioManager.RINGER_MODE_SILENT);
    am01.getStreamVolume(AudioManager.STREAM_RING);
    Toast.makeText(A11Activity.this, "黑名单中的电话静音！！", Toast.LENGTH_LONG).show();
    }
   }
   super.onCallStateChanged(state, incomingNumber);
   et.setOnKeyListener(new OnKeyListener(){
    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {
    // TODO Auto-generated method stub
    tv01.setText(et.getText());
    et.setText("");
    return true;
    }
    });
   }
  }
}