嘿，我想通过保存菜单将用户制作的图像保存在 fingerpaint API 中。
这里是活动课`
public int mImageCount = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button res = (Button) findViewById(R.id.reset);
res.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method
TouchEventView touchView = (TouchEventView) findViewById(R.id.mydrawview1);
touchView.clear();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_name, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.save:
save();
return true;
case R.id.open:
open();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void save() {
TouchEventView touchview = (TouchEventView) findViewById(R.id.mydrawview1);
File myDir = new File("/sdcard/saved_images");
if (!myDir.exists())
myDir.mkdirs();
mImageCount++;
String fname = "image-" + mImageCount + ".jpg";
File file = new File(myDir, fname);
if (file.exists())
file.delete();
touchview.saveAsJpg(file);
Toast.makeText(this, "Image has been saved", 7000).show();
}
public void open() {
TextView tv = new TextView(this);
tv.setText("Hello, Android");
setContentView(tv);
}
}
` 这是视图类
public class TouchEventView extends View {
private static Bitmap mBitmap;
private Paint paint = new Paint();
private Path path = new Path();
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
public TouchEventView(Context context, AttributeSet attrs) {
super(context, attrs);
paint.setAntiAlias(true);
paint.setColor(Color.WHITE);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeWidth(5f);
mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(0xFFAAAAAA);
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(path, paint);
}
public void clear() {
path = new Path();
invalidate();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float eventX = event.getX();
float eventY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
path.moveTo(eventX, eventY);
return true;
case MotionEvent.ACTION_MOVE:
path.lineTo(eventX, eventY);
break;
case MotionEvent.ACTION_UP:
// nothing to do
break;
default:
return false;
}
// Schedules a repaint.
invalidate();
return true;
}
public void saveAsJpg(File f) {
String fname = f.getAbsolutePath();
FileOutputStream fos = null;
try {
fos = new FileOutputStream(f);
// Take the bitmap of the view and write it out as a jpeg.
mBitmap.compress(CompressFormat.JPEG, 95, fos);
} catch (Throwable ex) {
ex.printStackTrace();
}
}
}
` 我已经编辑了我的代码。它只保存了一个空白屏幕。为什么没有保存指纹图像？请帮帮我