在两个活动之间传递位图 [英] Passing Bitmap between two activities
本文介绍了在两个活动之间传递位图的处理方法，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
我正在开发一个绘画应用程序，我想在其中将位图图像从一个活动传递到另一个活动，但该项目没有响应.我将相对布局截图转换为位图并通过Intent传递但问题没有解决.这是我的代码....
I am developing a painting app in which i want to pass a Bitmap image from one activity to another but the project is not responding. I converted the relative layout screenshot into a bitmap and passing it through Intent but the problem is not solved. Here is my code....
绘图活动
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, h, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawBitmap(mBitmap, 0, 0, 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();
}
}
}
图像活动
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"),0,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, 0, byteArray.length);
img.setImageBitmap(bmp);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_image, menu);
return true;
}
}
位置报告
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
推荐答案
你可以简单地试试下面的 -
You can simply try with below -
Intent i = new Intent(this, Second.class)
i.putExtra("Image", bitmap);
startActivity(i)
而且，在Second.class
Bitmap bitmap = (Bitmap) intent.getParcelableExtra("Image");
看看这里如果你想在发送到下一个之前压缩你的Bitmap活动请看下面 -
Have a look at here If you want to compress your Bitmap before sending to next activity just have a look at below -
Intent i = new Intent(this, NextActivity.class);
Bitmap b; // your bitmap
ByteArrayOutputStream bs = new ByteArrayOutputStream();
b.compress(Bitmap.CompressFormat.PNG, 50, bs);
i.putExtra("byteArray", bs.toByteArray());
startActivity(i);
在您的下一个活动中 -
in your nextactivity -
if(getIntent().hasExtra("byteArray")) {
ImageView previewThumbnail = new ImageView(this);
Bitmap b = BitmapFactory.decodeByteArray(
getIntent().getByteArrayExtra("byteArray"),0,getIntent()
.getByteArrayExtra("byteArray").length);
previewThumbnail.setImageBitmap(b);
}
这篇关于在两个活动之间传递位图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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