/**
 * Created by qssq on 2018/7/31 qssq666@foxmail.com
 */
public class ActivityToast extends Activity {

    @Override
    protected void onCreate( Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        getWindow().getAttributes().flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
        getWindow().getAttributes().format = PixelFormat.TRANSLUCENT;

        Intent intent = getIntent();

        String title = intent.getStringExtra("title");
        int duration = intent.getIntExtra("duration", 1000);

        FrameLayout frameLayout = new FrameLayout(this);

        TextView view = new TextView(this);
        view.setText(title);
        view.setPadding(30, 10, 10, 10);
        frameLayout.addView(view);
        setContentView(frameLayout);

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                finish();

            }
        }, duration);



    }

    public static void showToast(Context context, String message, int duration) {
        Intent intent = new Intent(context, ActivityToast.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS | Intent.FLAG_ACTIVITY_SINGLE_TOP);
//        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS | Intent.FLAG_ACTIVITY_SINGLE_TOP);
//        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra("title", message);
        intent.putExtra("duration", duration);
        context.startActivity(intent);
    }
}

缺点明显，影响返回键操作。影响任务栈，因此不可行。