Question

Android RotateAnimation失效

代码如下：一个imageview，添加一个rotateanimation.
问题：onCreate()时anim.start()可以生效看到imageview旋转，但是在onclick时anim.start()却失效了，imageview没有旋转，求解！实在不知道原因是啥了，谢谢！

package com.testandroid;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements OnClickListener {
private ImageView iv;
private RotateAnimation mAnim;

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

iv = (ImageView) findViewById(R.id.imageView1);
iv.setOnClickListener(this);

mAnim = new RotateAnimation(0.0F, 359.0F, Animation.RELATIVE_TO_SELF,
0.5F, Animation.RELATIVE_TO_SELF, 0.5F);
mAnim.setRepeatMode(Animation.REVERSE);
mAnim.setRepeatMode(Animation.INFINITE);
mAnim.setDuration(2000);

iv.setAnimation(mAnim);
mAnim.start();

}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.imageView1:

mAnim.start();
Toast.makeText(getApplicationContext(), "onclick",
Toast.LENGTH_SHORT).show();
break;

default:
break;
}

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

Answer 1

加断点用Debug调试，在onclick中的mAnim.start();，或者直接用System.out.println();，看问题出在哪

onCreate()方法中，iv.setOnClickListener(this);这句话放在最下面试试，就是mAnim.start()这句后面。