我有一个绘图应用程序,我有保存绘制的图片的方法。但我只得到一个带有保存按钮的黑色位图图片。问题出在哪里 ?
有我的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" />
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());
}
保存方法
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());
}
}
我的问题已经解决了,但我有一个小细节。当我更改我的 xml 时,我的应用程序崩溃了。对此。
<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" />