Android 图片渐变切换效果
2019-07-24 本文已影响0人
Cedric_h
原文:https://blog.csdn.net/uyy203/article/details/53992666
package com.example.xyz.colorchange;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout;
public class MainActivity extends AppCompatActivity {
private Drawable oldBackground = null;
private Drawable bg_a;
private Drawable bg_b;
LinearLayout up;
int isWhat=1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
up =(LinearLayout) findViewById(R.id.up);
up.setBackgroundResource(R.mipmap.a);
bg_a = getResources().getDrawable(R.mipmap.a);
bg_b =getResources().getDrawable(R.mipmap.b);
up.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(isWhat==1)
aTob();
else if(isWhat==2)
bToa();
}
});
}
private void aTob() {
up.setBackgroundResource(R.mipmap.a);
//渐变切换
TransitionDrawable td = new TransitionDrawable(new Drawable[]{bg_a, bg_b});
up.setBackgroundDrawable(td);
td.startTransition(1000);
isWhat=2;
}
private void bToa() {
up.setBackgroundResource(R.mipmap.b);
//渐变切换
TransitionDrawable td = new TransitionDrawable(new Drawable[]{bg_b, bg_a});
up.setBackgroundDrawable(td);
td.startTransition(1000);
isWhat=1;
}
}
假如需要 从透明渐变切换到特定背景的话 可以这样写
td = new TransitionDrawable(new Drawable[]{getResources().getDrawable(android.R.color.transparent),bg_on});
反之,把transitionDrawable数组中元素反过来即可.