实现步骤：
在res目录下新建一个:anim文件件，然后创建amin_pgbar.xml的资源文件：
android:oneshot="false" > android:drawable="@drawable/loading_01" android:duration="200"/> android:drawable="@drawable/loading_02" android:duration="200"/> android:drawable="@drawable/loading_03" android:duration="200"/> android:drawable="@drawable/loading_04" android:duration="200"/> android:drawable="@drawable/loading_05" android:duration="200"/> android:drawable="@drawable/loading_06" android:duration="200"/> android:drawable="@drawable/loading_07" android:duration="200"/> android:drawable="@drawable/loading_08" android:duration="200"/> android:drawable="@drawable/loading_09" android:duration="200"/> android:drawable="@drawable/loading_10" android:duration="200"/> android:drawable="@drawable/loading_11" android:duration="200"/> android:drawable="@drawable/loading_12" android:duration="200"/>
接着写个布局文件，里面仅仅有一个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，剩下的就你自己来了哦~在需要显示进度条的时候，让ImageView可见；
在不需要的时候让他隐藏即可！另外其实Progressbar本身有一个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，需要Java代码中
修改，如果你设置了宽高，而且这个宽高过大的时候，你会看到有多个进度条...自己权衡下吧~
3.自定义圆形进度条
相信你看完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，如果要显示进度的场合就没用处了，好吧，接下来看下
网上一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：
android:layout_width="match_parent" android:layout_height="match_parent"/> 就是这么简单~ 本节小结： 本节给大家介绍了Android中的常用控件：ProgressBar讲解了基本用法，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~！ 好的，本节就到这里，谢谢~