ImageView上的Android进度条
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Android Progress bar on ImageView
提问by Bhaskar Gyan Vardhan
I am developing an app in which user will take Picture from camera and display it on preview screen having image view.
我正在开发一个应用程序，用户将在其中从相机拍摄图片并将其显示在具有图像视图的预览屏幕上。
**CameraCapture.java**
class ButtonClickHandler implements View.OnClickListener
{
public void onClick( View view ){
myVib.vibrate(50);
startCameraActivity();
}
}
protected void startCameraActivity()
{
File filenew = new File( _path );
Uri outputFileUri = Uri.fromFile( filenew );
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );
intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivityForResult( intent, 0 );
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
switch( resultCode )
{
case 0:
break;
case -1:
//pictaken++;
onPhotoTaken();
break;
}
}
protected void onPhotoTaken()
{
//pictaken=true;
Intent i = new Intent(CameraCapture.this,Preview.class);
startActivity(i);
}
In my Preview class the captured picture is displayed on ImageView
在我的预览类中，捕获的图片显示在 ImageView 上
**Preview.java**
File imgFile = new File("/sdcard/DCIM/Camera/test.jpg");
if(imgFile.exists()){
// Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
ImageView myImage = (ImageView) findViewById(R.id.image);
Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
Matrix mat = new Matrix();
String degree="90";
mat.postRotate(Integer.parseInt(degree));
Bitmap bMapRotate = Bitmap.createBitmap(myBitmap, 0, 0,myBitmap.getWidth(),myBitmap.getHeight(), mat, true);
myImage.setImageBitmap(bMapRotate);
//myImage.setImageBitmap(myBitmap);
}
_image = ( ImageView ) findViewById( R.id.image );
Is there is any way to show progress bar on the ImageView till it load the Captured image from SD card. Thnx in advance :)
有什么方法可以在 ImageView 上显示进度条，直到它从 SD 卡加载捕获的图像。提前谢谢:)
回答by Lucas Arrefelt
Put your ImageView and Progressbar in a RelativeLayout. For your ProgressBar, use:
将你的 ImageView 和 Progressbar 放在一个 RelativeLayout 中。对于您的 ProgressBar，请使用：
android:layout_centerInParent="true"
Which will center it in the RelativeLayout, meaning over the ImageView. You might also want to hide the ProgressBar when the image has loaded:
它将在RelativeLayout 中居中，意思是在ImageView 之上。您可能还想在图像加载后隐藏 ProgressBar：
progressBar.setVisibility(View.Gone)
when the image has been loaded.
加载图像时。
Sample code:
示例代码：
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"/>
<ProgressBar
style="?android:attr/progressBarStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:visibility="visible"/>
</RelativeLayout>
回答by Denis Kutlubaev
This is my solution. It is a little bit different. You can use it to create intro view with an image and progress bar. Here, progress bar is at 150dp to the bottom of center. FrameLayoutcan also be used.
这是我的解决方案。它有点不同。您可以使用它来创建带有图像和进度条的介绍视图。在这里，进度条位于中心底部 150dp 处。FrameLayout也可以使用。
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="@string/intro_description"
android:scaleType="fitXY"
android:src="@drawable/intro" />
<ProgressBar
android:id="@+id/progress"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="150dp"
android:visibility="visible" />
</FrameLayout>
