package com.sinatj.colorgradientanim;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.graphics.drawable.TransitionDrawable;
import android.os.Build;
import android.os.Handler;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
public class MainActivity extends ActionBarActivity {
  private ImageView imageView;
  private Drawable oldBackground = null;
  private Drawable bgDrawable;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    imageView = (ImageView) findViewById(R.id.color_iv);
    bgDrawable = getResources().getDrawable(R.drawable.image_bg_1);
    //初始颜色
    changeColor(Color.parseColor("#6696AA39"));
  }
  private void changeColor(int newColor) {
    Drawable colorDrawable = new ColorDrawable(newColor);
    //图层叠加
    LayerDrawable ld = new LayerDrawable(new Drawable[]{bgDrawable, colorDrawable});
    if (oldBackground == null) {
      imageView.setBackgroundDrawable(ld);
    } else {
      //渐变切换
      TransitionDrawable td = new TransitionDrawable(new Drawable[]{oldBackground, ld});
      imageView.setBackgroundDrawable(td);
      td.startTransition(300);
    }
    oldBackground = ld;
  }
  public void onColorClicked(View v) {
    int color = Color.parseColor(v.getTag().toString());
    changeColor(color);
  }
}