Android 实现Activity后台运行

第一种方法

Intent intent = new Intent(Intent.ACTION_MAIN);intent.addCategory(Intent.CATEGORY_HOME);intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);startActivity(intent);

第二种方法

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。

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

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);}

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);}}

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