在res目录下新建个:anim文件件，然后创建amin_pgbar.xml的资源文件

<?xml version="1.0" encoding="UTF-8"?>  
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"  
    android:oneshot="false" >  
  
    <item  
        android:drawable="@drawable/loading_01"  
        android:duration="200"/>  
    <item  
        android:drawable="@drawable/loading_02"  
        android:duration="200"/>  
    <item  
        android:drawable="@drawable/loading_03"  
        android:duration="200"/>  
    <item  
        android:drawable="@drawable/loading_04"  
        android:duration="200"/>  
    <item  
        android:drawable="@drawable/loading_05"  
        android:duration="200"/>  
    <item  
        android:drawable="@drawable/loading_06"  
        android:duration="200"/>  
    <item  
        android:drawable="@drawable/loading_07"  
        android:duration="200"/>  
    <item  
        android:drawable="@drawable/loading_08"  
        android:duration="200"/>  
    <item  
        android:drawable="@drawable/loading_09"  
        android:duration="200"/>  
    <item  
        android:drawable="@drawable/loading_10"  
        android:duration="200"/>  
    <item  
        android:drawable="@drawable/loading_11"  
        android:duration="200"/>  
    <item  
        android:drawable="@drawable/loading_12"  
        android:duration="200"/>  
  
</animation-list> 

接着写个布局文件，里面仅仅有个ImageView即可，用于显示进度条，把src设置为上述drawable资源即可！最后到MainActivity.java

public class MainActivity extends AppCompatActivity {
    private ImageView img_pgbar;
    private AnimationDrawable ad;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        img_pgbar = (ImageView) findViewById(R.id.img_pgbar);
        ad = (AnimationDrawable) img_pgbar.getDrawable();
        img_pgbar.postDelayed(new Runnable() {
            @Override
            public void run() {
                ad.start();
            }
        }, 100);
    }
}

这里只是写了如何启动动画，剩下的就 自己来了哦~在要显示进度条的时候，让ImageView可见；在不要的时候让他隐藏即可！另外其实Progressbar本身有个indeterminateDrawable，只需把这个参数设置成上述的动画资源即可，但是进度条条的图案大小是不能直接修改的，要Java代码中修改，若 设置了宽高，且这个宽高过大的时候， 会看到有多个进度条...自己权衡下吧~

3.自定义圆形进度条

相信 看完2会吐槽，卧槽，这么坑爹，拿个动画来坑人，哈哈，实际开发中都这样，当然上述这种情况只适用于不用显示进度的场合，若要显示进度的场合就没用处了，好吧， 看下网上个简单的自定义圆形进度条！代码还是比较简单，容易理解，又兴趣可以看看，或者进行相关扩展~

运行效果图

实现代码

自定义View类

/**
 * Created by Jay on 2015/8/5 0005.
 */
public class CirclePgBar extends View {
    private Paint mBackPaint;
    private Paint mFrontPaint;
    private Paint mTextPaint;
    private float mStrokeWidth = 50;
    private float mHalfStrokeWidth = mStrokeWidth / 2;
    private float mRadius = 200;
    private RectF mRect;
    private int mProgress = 0;
    //目标值，想改多少就改多少
    private int mTargetProgress = 90;
    private int mMax = 100;
    private int mWidth;
    private int mHeight;
    public CirclePgBar(Context context) {
        super(context);
        init();
    }
    public CirclePgBar(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }
    public CirclePgBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }
    //完成相关参数初始化
    private void init() {
        mBackPaint = new Paint();
        mBackPaint.setColor(Color.WHITE);
        mBackPaint.setAntiAlias(true);
        mBackPaint.setStyle(Paint.Style.STROKE);
        mBackPaint.setStrokeWidth(mStrokeWidth);
        mFrontPaint = new Paint();
        mFrontPaint.setColor(Color.GREEN);
        mFrontPaint.setAntiAlias(true);
        mFrontPaint.setStyle(Paint.Style.STROKE);
        mFrontPaint.setStrokeWidth(mStrokeWidth);
        mTextPaint = new Paint();
        mTextPaint.setColor(Color.GREEN);
        mTextPaint.setAntiAlias(true);
        mTextPaint.setTextSize(80);
        mTextPaint.setTextAlign(Paint.Align.CENTER);
    }
    //重写测量大小的onMeasure方法和绘制View的核心方法onDraw()
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        mWidth = getRealSize(widthMeasureSpec);
        mHeight = getRealSize(heightMeasureSpec);
        setMeasuredDimension(mWidth, mHeight);
    }
    @Override
    protected void onDraw(Canvas canvas) {
        initRect();
        float angle = mProgress / (float) mMax * 360;
        canvas.drawCircle(mWidth / 2, mHeight / 2, mRadius, mBackPaint);
        canvas.drawArc(mRect, -90, angle, false, mFrontPaint);
        canvas.drawText(mProgress + "%", mWidth / 2 + mHalfStrokeWidth, mHeight / 2 + mHalfStrokeWidth, mTextPaint);
        if (mProgress < mTargetProgress) {
            mProgress += 1;
            invalidate();
        }
    }
    public int getRealSize(int measureSpec) {
        int result = 1;
        int mode = MeasureSpec.getMode(measureSpec);
        int size = MeasureSpec.getSize(measureSpec);
        if (mode == MeasureSpec.AT_MOST || mode == MeasureSpec.UNSPECIFIED) {
            //自己计算
            result = (int) (mRadius * 2 + mStrokeWidth);
        } else {
            result = size;
        }
        return result;
    }
    private void initRect() {
        if (mRect == null) {
            mRect = new RectF();
            int viewSize = (int) (mRadius * 2);
            int left = (mWidth - viewSize) / 2;
            int top = (mHeight - viewSize) / 2;
            int right = left + viewSize;
            int bottom = top + viewSize;
            mRect.set(left, top, right, bottom);
        }
    }
}

然后在布局文件中加上

 <com.jay.progressbardemo.CirclePgBar
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

就是这么简单~

本节小结

介绍了Android中的常用控件ProgressBar讲解了用法，以及实际开发中对于进度条的两种实现方法，第二个自定义进度条可以自行完善，然后用到实际开发中~！ 本节就到这里，