編輯:關於android開發
用list保存activity實例,然後逐一干掉
import java.util.LinkedList; import java.util.List; import android.app.Activity; import android.app.AlertDialog; import android.app.Application; import android.content.DialogInterface; import android.content.Intent; public class SysApplication extends Application { private List<Activity> mList = new LinkedList<Activity>(); private static SysApplication instance; private SysApplication() { } public synchronized static SysApplication getInstance() { if (null == instance) { instance = new SysApplication(); } return instance; } // add Activity public void addActivity(Activity activity) { mList.add(activity); } public void exit() { try { for (Activity activity : mList) { if (activity != null) activity.finish(); } } catch (Exception e) { e.printStackTrace(); } finally { // System.exit(0);//去掉這個 } } @Override public void onLowMemory() { super.onLowMemory(); System.gc(); } } 在每個Activity的onCreate方法中添加類似代碼: public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); SysApplication.getInstance().addActivity(this); }
在需要退出程序的時候,調用:
SysApplication.getInstance().exit();
簡而言之,通過單例模式把每個Activity 的引用添加到一個全局鏈表中,每次退出程序調用System.exit(0)時,先調用鏈表中Activity 的finish方法
優點:實現簡單,邏輯清晰
推薦!!好方便!!
基本邏輯就是:定義一個BaseActivity,在這個Activity中綁定廣播,在廣播的onReceive方法中調用finish();然後以後的Activity都繼承這個Activity,退出時發送廣播,退出BaseActivity,父activity都退出了,子activity肯定退出。
代碼如下:
import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.support.v7.app.AppCompatActivity; public class BaseActivity extends AppCompatActivity { protected BroadcastReceiver broadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { finish(); } }; @Override public void onResume() { super.onResume(); // 在當前的activity中注冊廣播 IntentFilter filter = new IntentFilter(); filter.addAction("ExitApp"); this.registerReceiver(this.broadcastReceiver, filter); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); //解除綁定 this.unregisterReceiver(this.broadcastReceiver); } }
一個Activity實例:
import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.KeyEvent; import android.view.View; import android.widget.Button; import android.widget.Toast; public class ActivityC extends BaseActivity { Button btn; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_activity_c); SysApplication.getInstance().addActivity(this); btn = (Button) findViewById(R.id.acticityc_btn); //關閉所有的activity btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { } }); } /** * 捕獲手機物理菜單鍵 */ 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() { //第二種退出方法 // SysApplication.getInstance().exit(); Intent intent = new Intent(); intent.setAction("ExitApp"); this.sendBroadcast(intent); //super.finish(); } @Override protected void onStop() { super.onStop(); Log.i("tag","ActivityC-onStop"); } @Override protected void onDestroy() { super.onDestroy(); Log.i("tag","ActivityC-onDestroy"); } }
就是在退出的地方調用這個:
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() { //第二種退出方法 // SysApplication.getInstance().exit(); Intent intent = new Intent(); intent.setAction("ExitApp"); this.sendBroadcast(intent); //super.finish(); }
優點:方便,方便!!只需要在退出的地方發送廣播就可以!!
這是我的退出時的輸出:
08-09 15:33:48.869 26919-26919/example.com.closeapp I/tag: MainActivity-onPause 08-09 15:33:49.279 26919-26919/example.com.closeapp I/tag: MainActivity-onStop 08-09 15:33:51.569 26919-26959/example.com.closeapp D/OpenGLRenderer: endAllStagingAnimators on 0x55850598b0 (RippleDrawable) with handle 0x5585041510 08-09 15:33:56.079 26919-26919/example.com.closeapp I/tag: MainActivity-onDestroy 08-09 15:33:56.089 26919-26919/example.com.closeapp I/tag: ActivityB-onDestroy 08-09 15:33:56.399 26919-26919/example.com.closeapp I/tag: ActivityC-onDestroy
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