android - 音量键长按事件

Question

我想在特定时间按下音量增大按钮时发出 toast 消息。

public class MainActivity extends Activity {
@Override
public boolean onKeyDown(int keyCode, KeyEvent event){
    if(keyCode==KeyEvent.KEYCODE_VOLUME_UP){
        event.startTracking();
        return true;
    }
    return super.onKeyDown(keyCode,event);
}
@Override
public boolean onKeyLongPress(int keyCode,KeyEvent event){
    if(keyCode==KeyEvent.KEYCODE_VOLUME_UP){
        Toast.makeText(this, "Volume Up Pressed", Toast.LENGTH_SHORT).show();
        return true;
    }
    return onKeyLongPress(keyCode,event);
} }

这是在长按时发出 toast 消息但我想在按下按钮 5 秒时 toast ，我如何为此指定一个特定的持续时间!

Answer 1

声明全局计数变量:int count = 0 和 int key, keyEvent;

在你的按键方法中添加这个

public class MainActivity extends Activity {
@Override
public boolean onKeyDown(int keyCode, KeyEvent event){
 if(keyCode==KeyEvent.KEYCODE_VOLUME_UP){
     key = keyCode;
     keyEvent = KeyEvent.KEYCODE_VOLUME_UP;
    new CountDownTimer(5000, 1000) {

public void onTick(long millisUntilFinished) {
    if(key==keyEvent){
      count++; 
    }
     else{
      count = 0;
     }  
}
public void onFinish() {
    if(count = 5){
      //Notify Them it's been 5 seconds
      }
     count = 0;
 }
}.start();
    return true;
  }
 return super.onKeyDown(keyCode,event);
}