保存视图像位图，我只得到黑屏 [英] Save view like bitmap, I only get black screen
本文介绍了保存视图像位图，我只得到黑屏的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个绘图应用程序，我有救了绘制的图片的方法。但我只得到与保存按钮，黑色的位图图片。问题出在哪里？
I have a drawing application and I have methods for saving pictures drawn. But I only get a black bitmap picture with the save button. Where is the problem ?
还有就是我的XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/all"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/black"
tools:context=".Circle"
>
<org.vkedco.mobappdev.draw_touch_drive_00001.krouzky
android:id="@+id/pntr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:tag="Painter" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView3"
android:layout_below="@+id/button4"
android:layout_marginTop="50dp"
android:text="value"
android:textColor="@color/white" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/button2"
android:text="Add" />
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Delete" />
<Button
android:id="@+id/button6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Save"
android:layout_marginTop="45dp"
android:layout_alignLeft="@+id/button3" />
<Button
android:id="@+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Clear"
android:layout_marginTop="45dp"
android:layout_alignRight="@+id/button3" />
<LinearLayout
android:orientation="vertical"
android:layout_height="match_parent"
android:id="@+id/linearLayout"
android:layout_width="match_parent" />
和我的主要活动：
public class aktivita extends Activity{
Button btn;
public LinearLayout mContent;
krouzky mTicTacToeView = null;
public static String tempDir;
public File mypath;
public static Bitmap mBitmap;
public static int width;
public static int height;
public static float x;
public static float y;
public static float X;
public static float Y;
public static double vzdalenost;
public String current = null;
private String uniqueId;
public krouzky mSignature;
public View mView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.zaznam_ran);
krouzky.t = 0;
File directory = new File(Environment.getExternalStorageDirectory() + "/Images");
if(!directory.exists())
directory.mkdir();
uniqueId = getTodaysDate() + "_" + getCurrentTime();
current = uniqueId + ".png";
mypath= new File(directory,current);
mContent = (LinearLayout) findViewById(R.id.linearLayout);
mSignature = new krouzky(this, null);
mSignature.setBackgroundColor(Color.TRANSPARENT);
mContent.addView(mSignature, LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
mView = mContent;
Display display = getWindowManager().getDefaultDisplay();
width = (display.getWidth());
height = (display.getHeight());
mTicTacToeView = (krouzky) this.findViewById(R.id.pntr);
Button btn6 = (Button) findViewById(R.id.button6);
btn6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.v("log_tag", "Panel Saved");
mView.setDrawingCacheEnabled(true);
save(v);
}
});
}
private boolean prepareDirectory()
{
try
{
if (makedirs())
{
return true;
}
else
{
return false;
}
}
catch (Exception e)
{
e.printStackTrace();
Toast.makeText(this, "Could not initiate File System.. Is Sdcard mounted properly?", 1000).show();
return false;
}
}
private boolean makedirs()
{
File tempdir = new File(tempDir);
if (!tempdir.exists())
tempdir.mkdirs();
if (tempdir.isDirectory())
{
File[] files = tempdir.listFiles();
for (File file : files)
{
if (!file.delete())
{
System.out.println("Failed to delete " + file);
}
}
}
return (tempdir.isDirectory());
}
方法保存
public void save(View v)
{
Log.v("log_tag", "Width: " + v.getWidth());
Log.v("log_tag", "Height: " + v.getHeight());
if(mBitmap == null)
{
mBitmap = Bitmap.createBitmap (width, height, Bitmap.Config.RGB_565);
}
Canvas canvas = new Canvas(mBitmap);
try
{
FileOutputStream mFileOutStream = new FileOutputStream(mypath);
v.draw(canvas);
mBitmap.compress(Bitmap.CompressFormat.PNG, 90, mFileOutStream);
mFileOutStream.flush();
mFileOutStream.close();
}
catch(Exception e)
{
Log.v("log_tag", e.toString());
}
}
我的问题，就解决了，但我有一个小细节。我的应用程序下来，当我改变我的XML。此。
My problem, was resolved, but I have one small detail. My application get down, when I change my xml. to this.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/rl"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/black"
tools:context=".Circle" >
<org.vkedco.mobappdev.draw_touch_drive_00001.krouzky
android:id="@+id/pntr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:tag="Painter" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/button2"
android:text="Add" />
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Delete" />
<Button
android:id="@+id/button6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Save"
android:layout_marginTop="45dp"
android:layout_alignLeft="@+id/button3" />
<Button
android:id="@+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="Clear"
android:layout_marginTop="45dp"
android:layout_alignRight="@+id/button3" />
<LinearLayout
android:orientation="vertical"
android:layout_height="match_parent"
android:id="@+id/linearLayout"
android:layout_width="match_parent" >
</LinearLayout>
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/button6"
android:layout_marginTop="21dp"
android:text="value"
android:textColor="@color/blue" />
推荐答案
其实你是路过的查看（V）的按钮的btn6 的方法保存（V） - 通过线性布局对象，它是 mcontent 或 MVIEW ，那么这将是保存（mContent），这将解决你的问题。
Actually You are passing the view (v) of your Button btn6 in method save(v)- Pass linear layout object which is mcontent or mView, then that would be save(mContent), This will solve your problem
您可以试试这个方法还 -
You can try this method also-
通过你的父母布局或视图的方法 -
Pass your parent layout or view in method-
Bitmap file = save(mcontent);
Bitmap save(View v)
{
Bitmap b = Bitmap.createBitmap(v.getWidth(), v.getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
v.draw(c);
return b;
}
这篇关于保存视图像位图，我只得到黑屏的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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