Question

StreamingReader.builder().read(file)

Answer 1

您可以自定义进度条。自定义ProgressBar需要定义进度条的背景和进度的属性。

在res-＆gt; drawable文件夹中创建一个名为customprogressbar.xml的XML文件：

custom_progressbar.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- Define the background properties like color etc -->
    <item android:id="@android:id/background">
    <shape>
        <gradient
                android:startColor="#000001"
                android:centerColor="#0b131e"
                android:centerY="1.0"
                android:endColor="#0d1522"
                android:angle="270"
        />
    </shape>
   </item>

  <!-- Define the progress properties like start color, end color etc -->
  <item android:id="@android:id/progress">
    <clip>
        <shape>
            <gradient
                android:startColor="#007A00"
                android:centerColor="#007A00"
                android:centerY="1.0"
                android:endColor="#06101d"
                android:angle="270"
            />
        </shape>
    </clip>
    </item>
</layer-list>

现在需要在customprogressbar.xml（drawable）中设置progressDrawable属性

您可以在XML文件或Activity中（在运行时）执行此操作。

在XML中执行以下操作：

<ProgressBar
    android:id="@+id/progressBar1"
    style="?android:attr/progressBarStyleHorizontal"
    android:progressDrawable="@drawable/custom_progressbar"         
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
At run time do the following

// Get the Drawable custom_progressbar                     
    Drawable draw=res.getDrawable(R.drawable.custom_progressbar);
// set the drawable as progress drawable
    progressBar.setProgressDrawable(draw);

Answer 2

The question makes no sense at all. In the question you creates a ProgressDialog, which is infact a descendent of Dialog. A Dialog always have a background white/dark based on Application theme.

If you want just a Progress bar in the Activity,

Add

<ProgressBar  android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:id="@+id/pgBar"
android:indeterminate="true" />

in the Activity/Fragment's layout

And Access the Progressbar like this

ProgressBar pgBar = (ProgressBar) findViewById(R.id.pgBar);
pgBar.setIndeterminate(true);
pgBar.setVisibility(View.Visible)

Answer 3

The default backround for the progress bar is white.We can change the color of the progress bar by using 

 1. android:progressDrawable  in xml  OR
 2. setProgressDrawable(drawable) method programically.

drawable may be an image directly inseted to drawable folder or create a xml file in drawable folder.xml drawable is prefered since it is more optimal than image.

ProgressBar progessBar = new ProgressBar(MainActivity.this);
        Drawable dr=getResources().getDrawable(R.drawable.pink);
        pDialog.setProgressDrawable(dr);


where pink.xl is the xml file that describes the background for the progressbar

ProgressBar在运行时采用白色背景，如何从Progressbar中删除白色背景？

3 个答案: