比如有ActivityA， ActivityB，在ActivityB中关闭ActivityA
解决方案：1.
在 ActivityA 里面设置一个静态的变量instance,初始化为this
在 ActivityB 里面, ActivityA.instance.finish();
2.也可以通过ActivityManager ActivityManager manager = (ActivityManager)getSystemService(ACTIVITY_SERVICE); manager.restartPackage(packageName);
例子如下：
ActivityApackage com.activity.yuzhenbei;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.KeyEvent;import android.view.Menu;import android.view.MenuItem;public class MainActivity extends Activity { public static ActivityA instance = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activitya); instance = this; Intent intent = new Intent();intent.setClass(ActivityA.this, ActivityB.class);ActivityA.this.startActivity(intent); } // Menu // 当点击Menu按钮时，调用该方法 @Override public boolean onCreateOptionsMenu(Menu menu) { menu.add(0, 1, 1, R.string.help).setIcon( android.R.drawable.ic_menu_close_clear_cancel); return super.onCreateOptionsMenu(menu); }
// 选中某个菜 @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == 1) { Intent intent = new Intent();intent.setClass(ActivityA.this, ActivityB.class);ActivityA.this.startActivity(intent); } return super.onOptionsItemSelected(item); } // 返回键 @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) { // 如果是手机上的返回键 ActivityA.this.finish(); } return super.onKeyDown(keyCode, event); }}
ActivityBpackage com.activity.yuzhenbei;import android.app.Activity;import android.os.Bundle;import android.view.KeyEvent;import android.view.View;public class ActivityB extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activityb);}// 返回键@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK) { // 如果是手机上的返回键ActivityB.this.finish();ActivityA.instance.finish();}return super.onKeyDown(keyCode, event);}}
