在我的主应用程序类文件中，我有一个菜单按钮，单击该按钮可以保存sdcard中的位图。以下是代码： -
package org.testCircle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.os.Bundle;
import android.provider.MediaStore.Images;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;
public class testCircle extends Activity {
TextView tv;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(new customView(this));
setContentView(R.layout.main);
}
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
menu.add(0, 1, 0, "save").setShortcut('3', 'c');
return true;
}
public boolean onPrepareOptionsMenu(Menu menu) {
super.onPrepareOptionsMenu(menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case 1:
//new ColorPickerDialog(this, this, mPaint.getColor()).show();
fingerPaint cv = new fingerPaint(this);
Bitmap viewBitmap = Bitmap.createBitmap(480, 800,Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(viewBitmap);
cv.draw(canvas);
String url = Images.Media.insertImage(getContentResolver(), viewBitmap, "title", null);
Toast.makeText(testCircle.this, url, Toast.LENGTH_LONG).show();
return true;
}
return super.onOptionsItemSelected(item);
}
}
自定义视图：
package org.testCircle;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class fingerPaint extends View {
Paint mPaint;
private static final float MINP = 0.25f;
private static final float MAXP = 0.75f;
private static Bitmap mBitmap;
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
public fingerPaint(Context c) {
super(c);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(0xFFFF0000);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(12);
mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
}
public fingerPaint(Context c , AttributeSet attrs){
super(c , attrs);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(0xFFFF0000);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(12);
mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
}
public void onerase(){
mCanvas=null;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(0xFFAAAAAA);
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(mPath, mPaint);
}
private float mX, mY;
private static final float TOUCH_TOLERANCE = 4;
private void touch_start(float x, float y) {
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
private void touch_move(float x, float y) {
float dx = Math.abs(x - mX);
float dy = Math.abs(y - mY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
mX = x;
mY = y;
}
mCanvas.drawBitmap(mBitmap, mX, mY, mPaint);
}
private void touch_up() {
mPath.lineTo(mX, mY);
// commit the path to our offscreen
mCanvas.drawPath(mPath, mPaint);
// kill this so we don't double draw
mPath.reset();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touch_start(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touch_move(x, y);
invalidate();
break;
case MotionEvent.ACTION_UP:
touch_up();
invalidate();
Bundle b = new Bundle();
break;
}
return true;
}
}
答案 0 :(得分：8)
这是执行该操作的源代码
LinearLayout v = (LinearLayout) findViewById(R.id.mainLayout);
v.setDrawingCacheEnabled(true);
// this is the important code :)
// Without it the view will have a
// dimension of 0,0 and the bitmap will
// be null
v.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
v.layout(0, 0, v.getWidth(), v.getHeight());
v.buildDrawingCache(true);
Bitmap bm = Bitmap.createBitmap(v.getDrawingCache());
v.setDrawingCacheEnabled(false);
if (bm != null) {
try {
String path = Environment.getExternalStorageDirectory().toString();
OutputStream fOut = null;
File file = new File(path, "screentest.jpg");
fOut = new FileOutputStream(file);
bm.compress(Bitmap.CompressFormat.JPEG, 85, fOut);
fOut.flush();
fOut.close();
Log.e("ImagePath", "Image Path : " + MediaStore.Images.Media.insertImage( getContentResolver(), file.getAbsolutePath(), file.getName(), file.getName()));
}
catch (Exception e) {
e.printStackTrace();
}
}
希望这也适合你。
答案 1 :(得分：0)
你的fingerPaint类中有一个Bitmap对象。将FileOutputStream实例化到您要保存到的位置，并使用适当的选项和输出流调用mBitmap.compress方法。请记得关闭您的信息流。
答案 2 :(得分：0)
final View content = findViewById(R.id.layoutFP);
content.setDrawingCacheEnabled(true);
Bitmap bitmap = content.getDrawingCache();
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/saved_images");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "Image-"+ n +".jpg";
File file = new File (myDir, fname);
if (file.exists ()) file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
content.invalidate();
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory())));
} catch (Exception e) {
e.printStackTrace();
}finally{
content.setDrawingCacheEnabled(false);
}
最后在Manifest文件中添加权限：
＆LT; uses-permission android：name =“android.permission.WRITE_EXTERNAL_STORAGE”/＆gt;