我是android新手,有点小问题。
我找到了旋转成像的代码:
存储RotateAnimation所有数据的XML文件:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/linear_interpolator">
<rotate
android:fromDegrees="0"
android:toDegrees="360"
android:pivotX="50%"
android:pivotY="50%"
android:duration="20000"
android:startOffset="0"/>
</set>
Java文件:
package com.example.helloword;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;
public class Rotation_test extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rotation_test);
// getActionBar().setDisplayHomeAsUpEnabled(true);
Button buttonRotateCenter = (Button) findViewById(R.id.rotatecenter);
final ImageView floatingImage = (ImageView) findViewById(R.id.floatingimage);
final Animation animationRotateCenter = AnimationUtils.loadAnimation(
this, R.anim.rotate_center);
buttonRotateCenter.setOnClickListener(new Button.OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
floatingImage.startAnimation(animationRotateCenter);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_rotation_test, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}
如何创建XML文件中这两个值的变量?
android:fromDegrees="0"
android:toDegrees="360"
最佳答案
根据RotateAnimation类引用(http://developer.android.com/reference/android/view/animation/rotateAnimation.html),该类不提供FromDegrees和ToDegrees的setter方法。因此,如果需要在代码中设置这些值,则必须在代码中创建rotateAnimation对象,并将fromDegrees和toDegrees值传递到构造函数中。
RotateAnimation rotateAnimation = new RotateAnimation(fromDegrees, toDegrees);