我正在开发一个绘画应用程序,我想将Bitmap图像从一个活动传递给另一个活动,但项目没有响应.我将相对布局截图转换为位图,并通过Intent传递,但问题尚未解决.这是我的代码….
DrawingActivity
package com.newdrawing;
public class DrawingActivity extends Activity {
private Bitmap mBitmap;
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
private Paint mPaint;
MyDrawView myDrawView;
RelativeLayout parent;
Bitmap bitmap;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drawing);
parent = (RelativeLayout) findViewById(R.id.singleparent);
myDrawView = new MyDrawView(this);
parent.addView(myDrawView);
Activity context;
//RelativeLayout item = (RelativeLayout)findViewById(R.id.item);
View child = getLayoutInflater().inflate(R.layout.trans,null);
parent.addView(child);
}
public void color(View v) {
switch (v.getId()) {
case R.id.button3:
parent.setBackgroundColor(Color.RED);
break;
case R.id.button4:
parent.setBackgroundColor(Color.GREEN);
break;
case R.id.button5:
parent.setBackgroundColor(Color.BLUE);
break;
}
}
public void save(View v) {
parent.setDrawingCacheEnabled(true);
bitmap=parent.getDrawingCache();
parent.setDrawingCacheEnabled(false);
Log.e("Bitmap",String.valueOf(bitmap));
// send();
//Canvas c = new Canvas(bitmap);
//.draw(c);
// File outputFile; // Where to save it
//FileOutputStream out = new FileOutputStream(imageFile);
// boolean success = bitmap.compress(CompressFormat.PNG,100,out);
// out.close();
Intent i = new Intent(this,ImageActivity.class);
ByteArrayOutputStream bs = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG,50,bs);
byte[] byteArray = bs.toByteArray();
i.putExtra("byteArray",byteArray);
startActivity(i);
}
private void send()
{
Intent i9=new Intent(DrawingActivity.this,ImageActivity.class);
i9.putExtra("Image",bitmap);
startActivity(i9);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_drawing,menu);
return true;
}
public class MyDrawView extends View {
public MyDrawView(Context c) {
super(c);
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(0xFF000000);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(3);
}
@Override
protected void onSizeChanged(int w,int h,int oldw,int oldh) {
super.onSizeChanged(w,h,oldw,oldh);
mBitmap = Bitmap.createBitmap(w,Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawBitmap(mBitmap,mBitmapPaint);
canvas.drawColor(Color.TRANSPARENT);
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;
}
}
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();
break;
}
return true;
}
public void clear(){
mBitmap.eraseColor(Color.TRANSPARENT);
invalidate();
System.gc();
}
}
}
ImageActivity
package com.newdrawing;
public class ImageActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image);
Intent i = getIntent();
ImageView img=(ImageView)findViewById(R.id.image11);
/*
if(getIntent().hasExtra("byteArray"))
{
Bitmap b = BitmapFactory.decodeByteArray(
getIntent().getByteArrayExtra("byteArray"),getIntent().getByteArrayExtra("byteArray").length);
img.setImageBitmap(b);
Log.e("Bitmap",String.valueOf(b));
}*/
Bundle extras = getIntent().getExtras();
byte[] byteArray = extras.getByteArray("byteArray");
Bitmap bmp = BitmapFactory.decodeByteArray(byteArray,byteArray.length);
img.setImageBitmap(bmp);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_image,menu);
return true;
}
}
地点报告
10-16 10:39:22.653: E/AndroidRuntime(339): FATAL EXCEPTION: main 10-16 10:39:22.653: E/AndroidRuntime(339): java.lang.IllegalStateException: Could not execute method of the activity 10-16 10:39:22.653: E/AndroidRuntime(339): at android.view.View$1.onClick(View.java:2072) 10-16 10:39:22.653: E/AndroidRuntime(339): at android.view.View.performClick(View.java:2408) 10-16 10:39:22.653: E/AndroidRuntime(339): at android.view.View$PerformClick.run(View.java:8816) 10-16 10:39:22.653: E/AndroidRuntime(339): at android.os.Handler.handleCallback(Handler.java:587) 10-16 10:39:22.653: E/AndroidRuntime(339): at android.os.Handler.dispatchMessage(Handler.java:92) 10-16 10:39:22.653: E/AndroidRuntime(339): at android.os.Looper.loop(Looper.java:123) 10-16 10:39:22.653: E/AndroidRuntime(339): at android.app.ActivityThread.main(ActivityThread.java:4627) 10-16 10:39:22.653: E/AndroidRuntime(339): at java.lang.reflect.Method.invokeNative(Native Method) 10-16 10:39:22.653: E/AndroidRuntime(339): at java.lang.reflect.Method.invoke(Method.java:521) 10-16 10:39:22.653: E/AndroidRuntime(339): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 10-16 10:39:22.653: E/AndroidRuntime(339): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 10-16 10:39:22.653: E/AndroidRuntime(339): at dalvik.system.NativeStart.main(Native Method) 10-16 10:39:22.653: E/AndroidRuntime(339): Caused by: java.lang.reflect.InvocationTargetException 10-16 10:39:22.653: E/AndroidRuntime(339): at com.newdrawing.DrawingActivity.save(DrawingActivity.java:91) 10-16 10:39:22.653: E/AndroidRuntime(339): at java.lang.reflect.Method.invokeNative(Native Method) 10-16 10:39:22.653: E/AndroidRuntime(339): at java.lang.reflect.Method.invoke(Method.java:521) 10-16 10:39:22.653: E/AndroidRuntime(339): at android.view.View$1.onClick(View.java:2067) 10-16 10:39:22.653: E/AndroidRuntime(339): ... 11 more 10-16 10:39:22.653: E/AndroidRuntime(339): Caused by: java.lang.IllegalStateException: Can't compress a recycled bitmap 10-16 10:39:22.653: E/AndroidRuntime(339): at android.graphics.Bitmap.checkRecycled(Bitmap.java:180) 10-16 10:39:22.653: E/AndroidRuntime(339): at android.graphics.Bitmap.compress(Bitmap.java:572) 10-16 10:39:22.653: E/AndroidRuntime(339): ... 15 more
解决方法
你可以简单地尝试下面 –
Intent i = new Intent(this,Second.class)
i.putExtra("Image",bitmap);
startActivity(i)
而且,在Second.class
Bitmap bitmap = (Bitmap) intent.getParcelableExtra("Image");
看看here如果要在发送到下一个活动之前压缩位图,请看下面的内容 –
Intent i = new Intent(this,NextActivity.class);
Bitmap b; // your bitmap
ByteArrayOutputStream bs = new ByteArrayOutputStream();
b.compress(Bitmap.CompressFormat.PNG,bs);
i.putExtra("byteArray",bs.toByteArray());
startActivity(i);
在你的下一个活动 –
if(getIntent().hasExtra("byteArray")) {
ImageView previewThumbnail = new ImageView(this);
Bitmap b = BitmapFactory.decodeByteArray(
getIntent().getByteArrayExtra("byteArray"),getIntent()
.getByteArrayExtra("byteArray").length);
previewThumbnail.setImageBitmap(b);
}
