在这里，总结一下loading进度条的使用简单总结一下。

一、说起进度条，必须说说条形进度条，经常都会使用到嘛，特别是下载文件进度等等，还有像腾讯QQ安装进度条一样，有个进度总给人良好的用户体验。

先来找图看看，做这个图完成不用图片就可以做到了。

Android loading进度条使用简单总结_圆形进度条

看下xml布局文件，其实就是直接用xml写的在加两个属性设置一下就好了，一个style,另一个是background。

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<ProgressBar
    android:id="@+id/pb_progressbar"
    style="@style/StyleProgressBarMini"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_margin="30dp"
    android:background="@drawable/shape_progressbar_bg"
    android:max="100"
    android:progress="50" />

先看style吧

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<style name="StyleProgressBarMini" parent="@android:style/Widget.ProgressBar.Horizontal"> 
    <item name="android:maxHeight">50dip</item> 
    <item name="android:minHeight">10dip</item> 
    <item name="android:indeterminateOnly">false</item> 
    <item name="android:indeterminateDrawable">@android:drawable/progress_indeterminate_horizontal</item> 
    <item name="android:progressDrawable">@drawable/shape_progressbar_mini</item> 
</style>

这里的progressDrawable又是引用一个自定义drawable，不是图片哦。

shape_progressbar_mini.xml

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<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <!-- 背景 -->
    <item android:id="@android:id/background">
        <shape>
            <corners android:radius="5dip" />
            <gradient
                android:angle="270"
                android:centerY="0.75"
                android:endColor="#FFFFFF"
                android:startColor="#FFFFFF" />
        </shape>
    </item>
    <item android:id="@android:id/secondaryProgress">
        <clip>
            <shape>
                <corners android:radius="0dip" />
 
                <gradient
                    android:angle="270"
                    android:centerY="0.75"
                    android:endColor="#df0024"
                    android:startColor="#df0024" />
            </shape>
        </clip>
    </item>
    <item android:id="@android:id/progress">
        <clip>
            <shape>
                <corners android:radius="5dip" />
                <gradient
                    android:angle="270"
                    android:centerY="0.75"
                    android:endColor="#de42ec"
                    android:startColor="#de42ec" />
            </shape>
        </clip>
    </item>
</layer-list>

再来看看shape_progressbar_bg.xml

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<?xml version="1.0" encoding="UTF-8"?>
    android:shape="rectangle" >
 
    <!-- 边框填充的颜色 -->
    <solid android:color="#cecece" />
 
    <!-- 设置进度条的四个角为弧形 -->
    <!-- android:radius 弧形的半径 -->
    <corners android:radius="90dp" />
    <!--
    padding：边界的间隔-->
    <padding
        android:bottom="1dp"
        android:left="1dp"
        android:right="1dp"
        android:top="1dp" />
</shape>

就这样把一个漂亮的条形进度条做好了，在shape_progressbar_bg.xml中，边框填充的颜色是一种挺好的方法，加了一个进度条的 边框。另外为了进度条四个角都是圆形的，就用了这个属性<corners android:radius="90dp" /> 。

搞定，这个时候可以开心一下了，去喝杯水先。

 

二、圆形进度条。另一个比较常用的就是圆形进度条，表示正在进行中。。。

来看2张小图

Android loading进度条使用简单总结_android_02 Android loading进度条使用简单总结_ide_03

先看第一张，分析下代码，用自定义的view,用pop来做的哦。LoadingDialog.java

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public class LoadingDialog {
    private Context context;
    private PopupWindow popupDialog;
    private LayoutInflater layoutInflater;
    private RelativeLayout layout;
    private RelativeLayout layout_bg;
    private View circleView;
    private RotateAnimation rotateAnim;
    private AlphaAnimation alphaAnim_in;
    private AlphaAnimation alphaAnim_out;
    public LoadingDialog(Context context) {
        layoutInflater = LayoutInflater.from(context);
        this.context = context;
    }
    private void initAnim() {
        rotateAnim = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
        rotateAnim.setDuration(2000);
        rotateAnim.setRepeatMode(Animation.RESTART);
        rotateAnim.setRepeatCount(-1);
        rotateAnim.setInterpolator(new LinearInterpolator());
        alphaAnim_in = new AlphaAnimation(0f, 1f);
        alphaAnim_in.setFillAfter(true);
        alphaAnim_in.setDuration(200);
        alphaAnim_in.setInterpolator(new LinearInterpolator());
        alphaAnim_out = new AlphaAnimation(1f, 0f);
        alphaAnim_out.setFillAfter(true);
        alphaAnim_out.setDuration(100);
        alphaAnim_out.setInterpolator(new LinearInterpolator());
        alphaAnim_out.setAnimationListener(new AnimationListener() {
            @Override
            public void onAnimationStart(Animation arg0) {
            }
            @Override
            public void onAnimationRepeat(Animation arg0) {
            }
            @Override
            public void onAnimationEnd(Animation arg0) {
                dismiss();
            }
        });
    }
 
    /**
     * 判断是否显示
     * @return
     */
    public boolean isShowing() {
        if (popupDialog != null && popupDialog.isShowing()) {
            return true;
        }
        return false;
    }
 
    /**
     * 显示
     */
    public void show() {
        dismiss();
        initAnim();
        layout = (RelativeLayout) layoutInflater.inflate(R.layout.view_loadingdialog, null);
        circleView = (View) layout.findViewById(R.id.loading_dialog);
        layout_bg = (RelativeLayout) layout.findViewById(R.id.bgLayout);
        popupDialog = new PopupWindow(layout, LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
        View parentView = ((Activity) context).getWindow().findViewById(Window.ID_ANDROID_CONTENT);
        popupDialog.showAtLocation(parentView, Gravity.CENTER, 0, 0);
 
        layout_bg.startAnimation(alphaAnim_in);
        circleView.startAnimation(rotateAnim);
    }
 
    /**
     * 隐藏
     */
    public void dismiss() {
        if (popupDialog != null && popupDialog.isShowing()) {
            layout_bg.clearAnimation();
            circleView.clearAnimation();
            popupDialog.dismiss();
        }
    }
}

这里呢引用了view_loadingdialog.xml，已作整个页面的背景和loading框。

view_loadingdialog.xml

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
<RelativeLayout
    android:id="@+id/bgLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#66000000" >
    <View
        android:id="@+id/loading_dialog"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_centerInParent="true"
        android:background="@drawable/shape_loading_dialog" />
</RelativeLayout>
</RelativeLayout>

再看看这个shape_loading_dialog.xml，绘制转动的圆形性状，又不用图片挺好的。

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<?xml version="1.0" encoding="utf-8"?>
    android:shape="oval" >
    <stroke
        android:width="3dp"
        android:dashWidth="2dp"
        android:dashGap="3dp"
        android:color="#fff"/>
    <gradient
        android:startColor="#00ffffff"
        android:endColor="#00ffffff"
        android:angle="180"/>
</shape>

就是这样子，实现了第一个圆形进度条。

可是如果做有颜色的圆形进度条呢，或者彩色的，后来想想不如加个图片来实现好了。

LoadingImgDialog.java

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public class LoadingImgDialog {
    private Context context;
    private PopupWindow popupDialog;
    private LayoutInflater layoutInflater;
    private RelativeLayout layout;
    private RelativeLayout layout_bg;
    private int residBg;
    private View loading_dialog;
    /** 背景添加旋转动画效果，实现了转动动作   **/
    private RotateAnimation rotateAnim;
    /** 透明度动画效果  **/
    private AlphaAnimation alphaAnim_in;
    private AlphaAnimation alphaAnim_out;
 
    public LoadingImgDialog(Context context, int residBg) {
        layoutInflater = LayoutInflater.from(context);
        this.residBg = residBg;
        this.context = context;
    }
    private void initAnim() {
        rotateAnim = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
        rotateAnim.setDuration(2000);
        rotateAnim.setRepeatMode(Animation.RESTART);
        rotateAnim.setRepeatCount(-1);
        rotateAnim.setInterpolator(new LinearInterpolator());
        alphaAnim_in = new AlphaAnimation(0f, 1f);
        alphaAnim_in.setFillAfter(true);
        alphaAnim_in.setDuration(200);
        alphaAnim_in.setInterpolator(new LinearInterpolator());
        alphaAnim_out = new AlphaAnimation(1f, 0f);
        alphaAnim_out.setFillAfter(true);
        alphaAnim_out.setDuration(100);
        alphaAnim_out.setInterpolator(new LinearInterpolator());
 
        /** 监听动作，动画结束时，隐藏LoadingColorDialog **/
        alphaAnim_out.setAnimationListener(new AnimationListener() {
            @Override
            public void onAnimationStart(Animation arg0) {
            }
            @Override
            public void onAnimationRepeat(Animation arg0) {
            }
            @Override
            public void onAnimationEnd(Animation arg0) {
                dismiss();
            }
        });
    }
 
    /**
     * 判断是否显示
     * @return
     */
    public boolean isShowing() {
        if (popupDialog != null && popupDialog.isShowing()) {
            return true;
        }
        return false;
    }
 
    /**
     * 显示
     */
    public void show() {
        dismiss();
 
        initAnim();
 
        layout = (RelativeLayout) layoutInflater.inflate(R.layout.view_loadingcolordialog, null);
        loading_dialog = (View) layout.findViewById(R.id.loading_dialog);
        loading_dialog.setBackgroundResource(residBg);
         
        layout_bg = (RelativeLayout) layout.findViewById(R.id.bgLayout);
        popupDialog = new PopupWindow(layout, LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
        View parentView = ((Activity) context).getWindow().findViewById(Window.ID_ANDROID_CONTENT);
        popupDialog.showAtLocation(parentView, Gravity.CENTER, 0, 0);
 
        layout_bg.startAnimation(alphaAnim_in);
        loading_dialog.startAnimation(rotateAnim);
    }
 
    /**
     * 隐藏
     */
    public void dismiss() {
        if (popupDialog != null && popupDialog.isShowing()) {
            layout_bg.clearAnimation();
            loading_dialog.clearAnimation();
            popupDialog.dismiss();
        }
    }
}

其实就是修改了一个地方，加入residBg，用图片资源设置圆形进度条那一小部分的背景。

稍稍修改一句代码换一张图片，就变成了另一个圆形进度条了，好玩吧。

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loadingColorDialog = new LoadingImgDialog(this, R.drawable.img_loading);
loadingColorDialog2 = new LoadingImgDialog(this, R.drawable.img_loading2);

给看看全屏效果图吧，就稍稍修改一句代码换一张图片哦。

Android loading进度条使用简单总结_xml_04

最后给MainActivity.java看看

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public class MainActivity extends Activity implements OnClickListener {
    Button bt_loading_dialog;
    Button bt_color_loading_dialog;
    Button bt_color_loading_dialog2;
     
    LoadingDialog loadingDialog;
    LoadingImgDialog loadingColorDialog;
    LoadingImgDialog loadingColorDialog2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         
        initView();
    }
 
    private void initView() {
        bt_loading_dialog = (Button) findViewById(R.id.bt_loading_dialog);
        bt_loading_dialog.setOnClickListener(this);
        bt_color_loading_dialog = (Button) findViewById(R.id.bt_loading_img_dialog);
        bt_color_loading_dialog.setOnClickListener(this);
         
        bt_color_loading_dialog2 = (Button) findViewById(R.id.bt_loading_img_dialog2);
        bt_color_loading_dialog2.setOnClickListener(this);
         
        loadingDialog = new LoadingDialog(this);
        loadingColorDialog = new LoadingImgDialog(this, R.drawable.img_loading);
        loadingColorDialog2 = new LoadingImgDialog(this, R.drawable.img_loading2);
    }
 
    @Override
    public void onClick(View view) {
        switch (view.getId()) {
        case R.id.bt_loading_dialog:
            loadingDialog.show();
            break;
        case R.id.bt_loading_img_dialog:
            loadingColorDialog.show();
            break;
        case R.id.bt_loading_img_dialog2:
            loadingColorDialog2.show();
            break;
        default:
            break;
        }
    }
     
    @Override
    protected void onDestroy() {
        super.onDestroy();
        loadingColorDialog.dismiss();
    }
 
    @Override
    public void onBackPressed() {
        if (loadingDialog.isShowing()) {
            loadingDialog.dismiss();
        } else if (loadingColorDialog.isShowing()){
            loadingColorDialog.dismiss();
        } else if (loadingColorDialog2.isShowing()){
            loadingColorDialog2.dismiss();
        } else {
            finish();
        }
    }
 
}