Android中使用广播机制退出Activity

为了代码的简洁性，抽取出一个基类BaseActivity（自定义的，当然，你也可以不写这个基类，只要在你项目的每个Activity里实现其中的代码即可），让你代码中要关闭的Activity都继承这个BaseActivity。 [php] public class BaseActivity extends Activity { protected BroadcastReceiver broadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { finish(); } }; @Override public void onResume() { super.onResume(); // 在当前的activity中注册广播 IntentFilter filter = new IntentFilter(); filter.addAction("ExitApp"); this.registerReceiver(this.broadcastReceiver, filter); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); this.unregisterReceiver(this.broadcastReceiver); } }[/php] 在你要关闭的Activity里添加myExit()方法，然后在要进行退出程序操作的地方调用myExit()方法就行。 [php] public class Activity1 extends BaseActivity { private Button btn1; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.a1); btn1 = (Button)findViewById(R.id.btn1); btn1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent i = new Intent(Activity1.this, Activity2.class); startActivity(i); } }); } /** * 捕获手机物理菜单键 */ private long exitTime = 0; @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode == KeyEvent.KEYCODE_BACK){//&& event.getAction() == KeyEvent.ACTION_DOWN if((System.currentTimeMillis()-exitTime) > 2000){ Toast.makeText(getApplicationContext(), "再按一次退出程序", Toast.LENGTH_SHORT).show(); exitTime = System.currentTimeMillis(); } else { myExit(); } return true; } return super.onKeyDown(keyCode, event); } protected void myExit() { Intent intent = new Intent(); intent.setAction("ExitApp"); this.sendBroadcast(intent); super.finish(); } }[/php]