app从主界面后退到桌面的几种处理方法

1，重写disatchKeyEvent(KeyEvent event)方法，使用路由跳转到桌面

@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);
    }