【Android進階學習】屏蔽，捕獲Home鍵

在Level5以上(包含)中，Activity類中的方法：public void onAttachedToWindow ()就能對Home鍵進行捕獲。具體代碼以下：

MainActivity.java

package com.lingdududu.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.WindowManager;
import android.widget.Toast;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    private boolean catchHomeKey = false;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    @Override
    public void onAttachedToWindow() {
        // TODO Auto-generated method stub
        if (!catchHomeKey) {
            this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
        }
        super.onAttachedToWindow();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        if (keyCode == KeyEvent.KEYCODE_HOME) {
            Toast.makeText(MainActivity.this, "你點擊了HOME鍵", Toast.LENGTH_LONG).show();
        }
        return super.onKeyDown(keyCode, event);
    }
}

當咱們點擊Home鍵的時候，程序並無回到主界面，而是停留在當前的頁面，而且能捕獲到Home鍵，調用Toast顯示信息。

效果圖：