Android 音量键的监听

实践后的结论:

下面两种都可以获取到音量键的东西,  测试的时候,发现

KeyEvent.KEYCODE_VOLUME_UP 一直按住的时候, 三星的一款平板计数到200,就不在触发该事件;

所以改为 KeyEvent.ACTION_DOWN 时启动一个方法用来计数, KeyEvent.ACTION_UP的停止技数;

package com.akm.testvolume;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.widget.TextView;

public class MainActivity extends Activity {
    private TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = (TextView) findViewById(R.id.tv);
    }

    int count = -1;

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {

        int action = event.getAction();

        if (action ==KeyEvent.ACTION_DOWN) {
            tv.setText("+++++++++ACTION_DOWN++++++"+ count++);
            return true;
        }

        if (action== KeyEvent.ACTION_UP) {
            tv.setText("+++++ACTION_UP++++++++++");
            return true;
        }

        return super.dispatchKeyEvent(event);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (keyCode) {

        case KeyEvent.KEYCODE_VOLUME_DOWN:

            tv.setText("-----------------"+count);
            count--;

            return true;

        case KeyEvent.KEYCODE_VOLUME_UP:
            tv.setText("++++++++++++++++"+ count);
            count++;
            return true;
        case KeyEvent.KEYCODE_VOLUME_MUTE:
            tv.setText("MUTE");

            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

}