android实现程序的后台运行

来源:互联网 发布:英伦 知乎 编辑:程序博客网 时间:2024/03/29 18:06
改写返回键事件监听,使得back键功能类似home键,让Acitivty退至后台时不被系统销毁,代码如下:public boolean onKeyDown(int keyCode, KeyEvent event) {          PackageManager pm = getPackageManager();          ResolveInfo homeInfo =             pm.resolveActivity(new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME), 0);         if (keyCode == KeyEvent.KEYCODE_BACK) {            ActivityInfo ai = homeInfo.activityInfo;              Intent startIntent = new Intent(Intent.ACTION_MAIN);              startIntent.addCategory(Intent.CATEGORY_LAUNCHER);              startIntent.setComponent(new ComponentName(ai.packageName, ai.name));              startActivitySafely(startIntent);              return true;          } else              return super.onKeyDown(keyCode, event);      }    private void startActivitySafely(Intent intent) {          intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);          try {              startActivity(intent);          } catch (ActivityNotFoundException e) {              Toast.makeText(this, "null",                      Toast.LENGTH_SHORT).show();          } catch (SecurityException e) {              Toast.makeText(this, "null",                      Toast.LENGTH_SHORT).show();           }      }文章转载自互联网,感谢原作者的无私分享。 

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