Android：手机在点击音量键模式后响铃

Question

android：我想让手机响铃并显示联系人信息（就像真正的电话一样）。当用户点击音量提高键3次，并保持在第三次点击。我希望即使在锁定屏幕的情况下也是如此。这可能吗？

谢谢！

我做了这个改变，我试图在我的星系s6上运行，并且应用程序崩溃。它会运行，但只要它打开它崩溃。 这里是代码

package example.org.getaway; 

import android.media.MediaPlayer; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.KeyEvent; 



public class MainActivity extends AppCompatActivity { 

static int number_of_times_volume_button_pressed = 0; 
final MediaPlayer iphonering = MediaPlayer.create(this, R.raw.iphone); 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
} 
@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    final MediaPlayer iphonering = MediaPlayer.create(this, R.raw.iphone); 
    if ((keyCode == KeyEvent.KEYCODE_VOLUME_DOWN)){ 

     if(number_of_times_volume_button_pressed==3) 
     { 
      iphonering.start(); 
      number_of_times_volume_button_pressed=0; 
     }else 
     { 
      number_of_times_volume_button_pressed++; 
     } 
    } 
    return true; 
} 

}

Answer 1

@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    if ((keyCode == KeyEvent.KEYCODE_VOLUME_DOWN)){ 
     //Do something 
     if(number_of_times_volume_button_pressed==3) 
     { 
       //Do something 
       number_of_times_volume_button_pressed=0; 
     }else 
     { 
       number_of_times_volume_button_pressed++; 
     } 
    } 
    return true; 
} 

使用上述方法。以类似的方式，你可以使用onKeyUp。

全球申报int number_of_times_volume_button_pressed=0。

你可以找到整个项目here