Android条纹进度条的实现(调整view宽度仿进度条)

前言

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方法如下：

美工同学指定了一个进度条样式

进度条样式

这斑斓的进度条，如果要自己画实在是劳民伤财。于是请美工切了一张素材。

素材样例

如果用shape或者.9图片不太好处理这个条纹。转变思路，放置2张图片。一张作为背景（底，bottom），一张作为进度条图片（cover）。

进度改变时，改变上面图片的宽度。

这就要求上面的图片是圆角的。自定义ImageView，调用canvas.clipPath来切割画布。

public class RoundCornerImageView extends android.support.v7.widget.AppCompatImageView {
 private float mRadius = 18;
 private Path mClipPath = new Path();
 private RectF mRect = new RectF();

 public RoundCornerImageView(Context context) {
 super(context);
 }

 public RoundCornerImageView(Context context, AttributeSet attrs) {
 super(context, attrs);
 }

 public RoundCornerImageView(Context context, AttributeSet attrs, int defStyle) {
 super(context, attrs, defStyle);
 }

 public void setRadiusDp(float dp) {
 mRadius = dp2px(dp, getResources());
 postInvalidate();
 }

 public void setRadiusPx(int px) {
 mRadius = px;
 postInvalidate();
 }

 @Override
 protected void onDraw(Canvas canvas) {
 mRect.set(0, 0, this.getWidth(), this.getHeight());
 mClipPath.reset(); // remember to reset path
 mClipPath.addRoundRect(mRect, mRadius, mRadius, Path.Direction.CW);
 canvas.clipPath(mClipPath);
 super.onDraw(canvas);
 }

 private float dp2px(float value, Resources resources) {
 return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, value, resources.getDisplayMetrics());
 }
}

每次绘制都切割一次圆角。记得调用Path.reset()方法。

回到我们要的进度条。布局文件中放置好层叠的图片。

 <RelativeLayout
 android:id="@+id/progress_layout"
 android:layout_width="190dp"
 android:layout_height="10dp"
 android:layout_centerInParent="true">

 <ImageView
  android:id="@+id/p_bot_iv"
  android:layout_width="190dp"
  android:layout_height="10dp"
  android:src="@drawable/shape_round_corner_bottom" />

 <com.rustfisher.view.RoundCornerImageView
  android:id="@+id/p_cover_iv"
  android:layout_width="100dp"
  android:layout_height="10dp"
  android:scaleType="centerCrop"
  android:src="@drawable/pic_cover_blue_white" />

 </RelativeLayout>

需要在代码中动态地改变cover的宽度；dialog中提供如下方法改变LayoutParams

 public void updatePercent(int percent) {
 mPercent = percent;
 mPercentTv.setText(String.format(Locale.CHINA, "%2d%%", mPercent));
 float percentFloat = mPercent / 100.0f;
 final int ivWidth = mBotIv.getWidth();
 RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) mProgressIv.getLayoutParams();
 int marginEnd = (int) ((1 - percentFloat) * ivWidth);
 lp.width = ivWidth - marginEnd;
 mProgressIv.setLayoutParams(lp);
 mProgressIv.postInvalidate();
 }

显示出dialog并传入进度，就可以看到效果了。

这只是实现效果的一种方法，如果有更多的想法，欢迎和我交流~

相关代码请参阅：

https://github.com/RustFisher/aboutView/blob/master/app/src/main/java/com/rust/aboutview/activity/RoundCornerActivity.java

package com.rust.aboutview.activity;

import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.support.annotation.Nullable;
import android.support.v4.app.DialogFragment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

import com.rust.aboutview.R;
import com.rust.aboutview.widget.RoundCornerProgressDialog;
import com.rustfisher.view.RoundCornerImageView;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

/**
 * 圆角图片示例
 * Created by Rust on 2018/5/23.
 */
public class RoundCornerActivity extends AppCompatActivity implements View.OnClickListener {

 @BindView(R.id.r_iv_1)
 RoundCornerImageView mRIv1;
 @BindView(R.id.r_iv_2)
 RoundCornerImageView mRIv2;
 @BindView(R.id.r_iv_3)
 RoundCornerImageView mRIv3;
 @BindView(R.id.r_iv_4)
 RoundCornerImageView mRIv4;

 private Handler mMainHandler = new Handler(Looper.getMainLooper());
 private RoundCornerProgressDialog mRoundCornerProgressDialog;
 private ProgressThread mProgressThread;

 @Override
 protected void onCreate(@Nullable Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.act_round_corner);
  initUI();
 }

 private void initUI() {
  ButterKnife.bind(this);
  mRIv1.setRadiusDp(12);
  mRIv2.setRadiusDp(23);
  mRIv3.setRadiusPx(40);
  mRIv4.setRadiusPx(200);
 }

 @OnClick(R.id.pop_dialog_btn)
 @Override
 public void onClick(View v) {
  switch (v.getId()) {
   case R.id.pop_dialog_btn:
    popRoundProgressDialog();
    break;
  }
 }

 private void popRoundProgressDialog() {
  if (null == mRoundCornerProgressDialog) {
   mRoundCornerProgressDialog = new RoundCornerProgressDialog();
  }
  mRoundCornerProgressDialog.setStyle(DialogFragment.STYLE_NORMAL, R.style.AppTranslucentOrigin);
  mRoundCornerProgressDialog.show(getSupportFragmentManager(), RoundCornerProgressDialog.F_TAG);
  if (null != mProgressThread) {
   mProgressThread.interrupt();
   try {
    mProgressThread.join(400);
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
   mProgressThread = null;
  }
  mProgressThread = new ProgressThread();
  mProgressThread.start();
 }

 private class ProgressThread extends Thread {

  private int progress = 0;

  @Override
  public void run() {
   super.run();
   while (!isInterrupted()) {
    progress++;
    try {
     Thread.sleep(50);
    } catch (InterruptedException e) {
     e.printStackTrace();
     break;
    }
    if (progress > 100) {
     progress = 0;
    }
    final int p = progress;
    mMainHandler.post(new Runnable() {
     @Override
     public void run() {
      mRoundCornerProgressDialog.updatePercent(p);
     }
    });
   }
  }
 }

}

总结

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