android退出模拟HOME键

转载请注明出处：https://blog.csdn.net/u011038298/article/details/89083020 

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        // 保存数据
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        // 恢复数据
    }

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
            if (event.getAction() == KeyEvent.ACTION_DOWN
                    && event.getRepeatCount() == 0) {
                // 如果用户点击了系统返回键，则模拟HOME键
                Intent intent = new Intent(Intent.ACTION_MAIN);
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                intent.addCategory(Intent.CATEGORY_HOME);
                startActivity(intent);
            }
            return true;
        }
        return super.dispatchKeyEvent(event);
    }

}

将app首页的按返回键响应修改为响应Home键，曲线救国。让用户以为app确实退出了，但是实际上是点了Home键。如此一来，下次点击app图标的时候，直接唤起，不需要进行初始化操作，主要可以避免再次走启动页。

效果：类似QQ/微信/IOS