Android 实现Activity后台运行（转）

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Android 实现Activity后台运行博客分类：?

androidAndroid

第一种方法

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Java代码??

1. Intent?intent?=?new?Intent(Intent.ACTION_MAIN);??
2. intent.addCategory(Intent.CATEGORY_HOME);??
3. intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);??
4. startActivity(intent);??

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第二种方法

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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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Java代码??

1. PackageManager?pm?=?getPackageManager();??
2. ??????????????????????????????ResolveInfo?homeInfo?=?pm.resolveActivity(new?Intent(Intent.ACTION_MAIN)??
3. .addCategory(Intent.CATEGORY_HOME),?0);??

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Java代码??

1. public?boolean?onKeyDown(int?keyCode,?KeyEvent?event)?{??
2. ????if?(keyCode?==?KeyEvent.KEYCODE_BACK)?{??
3. ????????ActivityInfo?ai?=?homeInfo.activityInfo;??
4. ????????Intent?startIntent?=?new?Intent(Intent.ACTION_MAIN);??
5. ????????startIntent.addCategory(Intent.CATEGORY_LAUNCHER);??
6. ????????startIntent.setComponent(new?ComponentName(ai.packageName,??
7. ????????????????ai.name));??
8. ????????startActivitySafely(startIntent);??
9. ????????return?true;??
10. ????}?else??
11. ????????return?super.onKeyDown(keyCode,?event);??
12. }??

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Java代码??

1. void?startActivitySafely(Intent?intent)?{??
2. ????intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);??
3. ????try?{??
4. ????????startActivity(intent);??
5. ????}?catch?(ActivityNotFoundException?e)?{??
6. ????????Toast.makeText(this,?R.string.unabletoopensoftware,??
7. ????????????????Toast.LENGTH_SHORT).show();??
8. ????}?catch?(SecurityException?e)?{??
9. ????????Toast.makeText(this,?R.string.unabletoopensoftware,??
10. ????????????????Toast.LENGTH_SHORT).show();??
11. ????????Log??
12. ????????????????.e(??
13. ????????????????????????TAG,??
14. ????????????????????????"Launcher?does?not?have?the?permission?to?launch?"??
15. ????????????????????????????????+?intent??
16. ????????????????????????????????+?".?Make?sure?to?create?a?MAIN?intent-filter?for?the?corresponding?activity?"??
17. ????????????????????????????????+?"or?use?the?exported?attribute?for?this?activity.",??
18. ????????????????????????e);??
19. ????}??
20. }??

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