- 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。
时间： 2024-11-09 00:17:26