Android(安卓)图片渐变切换效果

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.

github : https://github.com/Cedric-Xuan/colorChange

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