[英]how to capture the phone screen programmatically in android
我想知道如何以編程方式捕獲電話屏幕。 我只是谷歌搜索,知道我必須使用view.getDrawingCache()。 但是getDrawingCache()始終返回null。
我的xml布局是
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/screenlayout">
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/screen"
/>
</LinearLayout>
Java文件::
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
View vScreen = findViewById(R.id.screenlayout);
ImageView imageview = (ImageView)findViewById(R.id.screen);
Bitmap bitmap;
View v1 = vScreen.getRootView();
v1.setDrawingCacheEnabled(true);
bitmap = Bitmap.createBitmap(v1.getDrawingCache()); //getting null here
v1.setDrawingCacheEnabled(false)
imageview.setImageBitmap(bitmap);
}
有人可以糾正我哪里出問題了嗎?
使用以下代碼來避免空位圖:
public class AndroidWebImage extends Activity {
ImageView bmImage;
LinearLayout view;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
view = (LinearLayout)findViewById(R.id.screen);
bmImage = (ImageView)findViewById(R.id.image);
view.setDrawingCacheEnabled(true);
// this is the important code :)
// Without it the view will have a dimension of 0,0 and the bitmap will be null
view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
view.buildDrawingCache(true);
Bitmap b = Bitmap.createBitmap(view.getDrawingCache());
view.setDrawingCacheEnabled(false); // clear drawing cache
bmImage.setImageBitmap(b);
};
}
好好看看,您必須使用:
view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
我使用了以下main.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:id="@+id/screen"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<ImageView
android:id="@+id/image"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
所有允許截圖的程序僅能在有根手機上運行嗎? 如果您的手機是扎根手機,則可以嘗試使用此功能:
public class ScreenCapture extends Activity{
LinearLayout view;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
view = (LinearLayout)findViewById(R.id.screen);
Button myBtn = (Button)findViewById(R.id.myBtn);
myBtn.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
View v1 = view.getRootView();
System.out.println("Root View : "+v1);
v1.setDrawingCacheEnabled(true);
Bitmap bm = v1.getDrawingCache();
System.out.println("Bitmap : "+bm);
showScreen(bm);
}
});
}
}
您還可以看到此庫: Android屏幕截圖庫 (ASL)使您可以以編程方式從Android設備捕獲屏幕截圖,而無需具有root訪問權限
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