app从主界面后退到桌面的几种处理方法

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
Intent intent = new Intent();
intent.setAction("android.intent.action.MAIN");
intent.addCategory("android.intent.category.HOME");
startActivity(intent);
}
return false;
}

2，多次点击退出
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if ((System.currentTimeMillis() - mExitTime) > 2000) {
Object mHelperUtils;
show("再按一次退出程序");
mExitTime = System.currentTimeMillis();

} else {
finish();
}
return true;
}
return super.onKeyDown(keyCode, event);
}

3，多次点击最小化
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if ((System.currentTimeMillis() - mExitTime) > 2000) {
Object mHelperUtils;
show("再按一次退出程序");
mExitTime = System.currentTimeMillis();

} else {
//                finish();
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
return true;
}
return super.onKeyDown(keyCode, event);
}

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