Android 兑现Activity后台运行

Android 实现Activity后台运行

此方法其实不是主要是屏蔽Keycode_Back，让它不结束（finish()）Activity，直接显示HOME界面。

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public boolean onKeyDown(int keyCode, KeyEvent event) {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;} elsereturn super.onKeyDown(keyCode, event);}

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Java代码

void?startActivitySafely(Intent?intent)?{??????intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);??????try?{??????????startActivity(intent);??????}?catch?(ActivityNotFoundException?e)?{??????????Toast.makeText(this,?R.string.unabletoopensoftware,??????????????????Toast.LENGTH_SHORT).show();??????}?catch?(SecurityException?e)?{??????????Toast.makeText(this,?R.string.unabletoopensoftware,??????????????????Toast.LENGTH_SHORT).show();??????????Log??????????????????.e(??????????????????????????TAG,??????????????????????????"Launcher?does?not?have?the?permission?to?launch?"??????????????????????????????????+?intent??????????????????????????????????+?".?Make?sure?to?create?a?MAIN?intent-filter?for?the?corresponding?activity?"??????????????????????????????????+?"or?use?the?exported?attribute?for?this?activity.",??????????????????????????e);??????}??}?