【鼠】安卓学习杂记（五）——Android淡入图片

package com.example.administrator.myapplication;

import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.os.Build;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    ImageView imageView;
    ActionBar actionBar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化
        imageView = findViewById(R.id.iv1);
        //由颜色淡入图片
//        TransitionDrawable drawable = new TransitionDrawable(new Drawable[]{new ColorDrawable(Color.BLUE),
//              getResources().getDrawable(R.drawable.a)});
//        imageView.setImageDrawable(drawable);
//        drawable.setCrossFadeEnabled(true);
//        drawable.startTransition(500);
        //由图片a淡入图片b
        Drawable[] drawableArray = {
                getResources().getDrawable(R.drawable.a),
                getResources().getDrawable(R.drawable.b)
        };
        TransitionDrawable td = new TransitionDrawable(drawableArray);
        imageView.setImageDrawable(td);
        td.startTransition(3000);

        //沉浸式状态栏
        if (Build.VERSION.SDK_INT >= 21) {
            View decorView = getWindow().getDecorView();
            int option = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
            decorView.setSystemUiVisibility(option);
            getWindow().setStatusBarColor(Color.TRANSPARENT);
        }
        actionBar = getSupportActionBar();
        hideActionBar();//调用隐藏ActionBar的方法
    }
    //隐藏ActionBar的方法
    private void hideActionBar() {
        actionBar.hide();
    }
}