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android - 在 Fling 事件上制作动画

转载 作者:行者123 更新时间:2023-11-29 02:00:20 27 4
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package com.example.flingtry;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.drawable.AnimationDrawable;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.View.OnClickListener;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import android.support.v4.app.NavUtils;

public class MainActivity extends Activity implements OnClickListener
{
private static final int SWIPE_MIN_DISTANCE = 10;
private static final int SWIPE_MAX_OFF_PATH = 50;
private static final int SWIPE_THRESHOLD_VELOCITY = 10;
private GestureDetector gestureDetector;
TextView img;
AnimationDrawable ribinclickanimation;
Button btn1;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

gestureDetector = new GestureDetector(new MyGestureDetector());
img= (TextView) findViewById(R.id.img);
img.setBackgroundResource(R.anim.clickframeanimation);
ribinclickanimation= (AnimationDrawable) img.getBackground();
btn1= (Button) findViewById(R.id.btn1);
btn1.setOnClickListener(this);
// Set the touch listener for the main view to be our custom gesture listener
img.setOnTouchListener(new View.OnTouchListener()
{
public boolean onTouch(View v, MotionEvent event)
{
if (gestureDetector.onTouchEvent(event))
{
return true;
}
return false;
}
});
}
class MyGestureDetector extends SimpleOnGestureListener
{
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
{
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY)
{
ribinclickanimation.stop();
Toast.makeText(getApplicationContext(), "Helloooo", Toast.LENGTH_SHORT).show();
img.setBackgroundResource(R.anim.clickframeanimation);
ribinclickanimation= (AnimationDrawable) img.getBackground();
ribinclickanimation.start();
return false;
}
return false;
}

// It is necessary to return true from onDown for the onFling event to register
@Override
public boolean onDown(MotionEvent e)
{
return true;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2,float distanceX, float distanceY)
{
// beware, it can scroll to infinity
return true;
}
}
public void onClick(View arg0)
{
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "Helloooo", Toast.LENGTH_SHORT).show();
}
}

此代码用于使用 Gestures 在 fling 事件中对图像进行动画处理。但这里的问题是在拖动完成后动画需要时间发生。我想要的是当我向下拖动图像时应该同时动画。

最佳答案

建议使用onTouch代替手势监听器

为 MotionEvent.ACTION_DOWN 编写案例:MotionEvent.ACTION_UP: 和 MotionEvent.ACTION_MOVE

在 MotionEvent.ACTION_MOVE 中检测到移动方向后根据您想要的方向使用 view.setTranslationX 或 view.setTranslationY ....在您可以在 MotionEvent.ACTION_UP 中编写的某些拖动/移动之后,您可以根据需要放置您想要的东西

这只是可用代码的示例代码加载的说明 google it

关于android - 在 Fling 事件上制作动画,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13008435/

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