[英]Android: Taking screenshot of a View, Saving the image and retrieving it
我基本上试图在我的活动中捕获相对布局的屏幕截图并将其保存为 PNG 图像。 然后我需要将它作为位图文件检索。 我写了一些代码来完成这项工作,但遗憾的是屏幕截图没有保存在我的设备上。
XML
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/parent"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- Other views -->
</RelativeLayout>
代码:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_view);
//The view that needs to be captured as an image
parent = (RelativeLayout) findViewById(R.id.parent);
Bitmap image = getBitmapFromView(parent);
}
public static Bitmap getBitmapFromView(View view) {
Date now = new Date();
android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);
Bitmap returnBitmap = null;
try {
String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";
view.setDrawingCacheEnabled(true);
Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
view.setDrawingCacheEnabled(false);
File imageFile = new File(mPath);
FileOutputStream outputStream = new FileOutputStream(imageFile);
int quality = 100;
bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream);
outputStream.flush();
outputStream.close();
//Retrieve the image as a Bitmap and return it
if(imageFile.exists()){
returnBitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath());
}
} catch (Throwable e) {
// Several error may come out with file handling or OOM
e.printStackTrace();
}
return returnBitmap;
}
上面的代码不起作用。 没有错误,但未捕获和保存视图。 有人可以指出问题或给我一个更好的解决方案吗?
首先为相关视图分配一个id
使用findViewById()
获取引用然后按照此代码段进行操作
//定义一个带有View的高度和宽度的位图
Bitmap viewBitmap = Bitmap.createBitmap(v.getWidth(),v.getHeight(),Bitmap.Config.RGB_565);
Canvas viewCanvas = new Canvas(viewBitmap);
//get background of canvas
Drawable backgroundDrawable = v.getBackground();
if(backgroundDrawable!=null){
backgroundDrawable.draw(viewCanvas);//draw the background on canvas;
}
else{
viewCanvas.drawColor(Color.GREEN);
//draw on canvas
v.draw(viewCanvas)
}
//write the above generated bitmap to a file
String fileStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
OutputStream outputStream = null;
try{
imgFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),fileStamp+".png");
outputStream = new FileOutputStream(imgFile);
b.compress(Bitmap.CompressFormat.PNG,40,outputStream);
outputStream.close();
}
catch(Exception e){
e.printStackTrace();
}
用 JPEG 替换 PNG
不要忘记添加此权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
希望这可以帮助 :)
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