我正在尝试从相机捕获图像并将图像设置为自定义视图的背景，以便可以在其上进行绘制。但是我遇到了错误。 下面是导致错误的代码，任何人都可以在正确的路径上引导我。
private CustomView mCustomView;
Uri uri;
File file;
Drawable myDrawable;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_draw_view);
mCustomView = (CustomView)findViewById(R.id.custom_view);
//mCustomView.setBackground(mCustomView,R.drawable.one);
//mCustomView.setBackgroundResource();
Bundle extras = getIntent().getExtras();
uri = Uri.parse(extras.getString("imageUri"));
try {
InputStream inputStream = getContentResolver().openInputStream(uri);
myDrawable = Drawable.createFromStream(inputStream, uri.toString() );
mCustomView.setBackgroundResource(myDrawable);
} catch (FileNotFoundException e) {
myDrawable = getResources().getDrawable(R.drawable.one);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.undo:
mCustomView.onClickUndo();
return true;
case R.id.save:
saveThisDrawing();
return true;
}
return super.onOptionsItemSelected(item);
}
public void saveThisDrawing()
{
if (requestPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
String path = Environment.getExternalStorageDirectory().toString();
path = path + "/" + getString(R.string.app_name);
File dir = new File(path);
//save drawing
mCustomView.setDrawingCacheEnabled(true);
//attempt to save
String imTitle = "Drawing" + "_" + System.currentTimeMillis() + ".png";
String imgSaved = MediaStore.Images.Media.insertImage(
getContentResolver(), mCustomView.getDrawingCache(),
imTitle, "a drawing");
try {
if (!dir.isDirectory() || !dir.exists()) {
dir.mkdirs();
}
mCustomView.setDrawingCacheEnabled(true);
File file = new File(dir, imTitle);
FileOutputStream fOut = new FileOutputStream(file);
Bitmap bm = mCustomView.getDrawingCache();
bm.compress(Bitmap.CompressFormat.PNG, 100, fOut);
} catch (FileNotFoundException e) {
e.printStackTrace();
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Uh Oh!");
alert.setMessage("Oops! Image could not be saved. Do you have enough space in your device?1");
alert.setPositiveButton("OK", null);
alert.show();
}
if (imgSaved != null) {
Toast savedToast = Toast.makeText(getApplicationContext(),
"Drawing saved to Gallery!", Toast.LENGTH_SHORT);
savedToast.show();
}
mCustomView.destroyDrawingCache();
}
}
private boolean requestPermission(String writeExternalStorage) {
if(Build.VERSION.SDK_INT >= 24){
requestPermissions(new String[]{Manifest.permission.CAMERA,Manifest.permission.WRITE_EXTERNAL_STORAGE},2);
return true;
}
return true;
}
我的CustomView代码如下：
public class CustomView extends View {
private static final String LOG_CAT = CustomView.class.getSimpleName();
//drawing path
private Path drawPath;
//defines what to draw
private Paint canvasPaint;
//defines how to draw
private Paint drawPaint;
//initial color
private int paintColor = 0xFF660000;
private Paint _paintBlur;
//canvas - holding pen, holds your drawings
//and transfers them to the view
private Canvas drawCanvas;
//canvas bitmap
private Bitmap canvasBitmap;
//brush size
private float currentBrushSize, lastBrushSize;
private ArrayList<Path> paths = new ArrayList<Path>();
private ArrayList<Path> undonePaths = new ArrayList<Path>();
private float mX, mY;
private static final float TOUCH_TOLERANCE = 4;
private void init(){
currentBrushSize = 20;
lastBrushSize = currentBrushSize;
drawPath = new Path();
drawPaint = new Paint();
drawPaint.setColor(paintColor);
drawPaint.setAntiAlias(true);
drawPaint.setStrokeWidth(currentBrushSize);
drawPaint.setStyle(Paint.Style.STROKE);
drawPaint.setStrokeJoin(Paint.Join.ROUND);
drawPaint.setStrokeCap(Paint.Cap.ROUND);
canvasPaint = new Paint(Paint.DITHER_FLAG);
this._paintBlur = new Paint();
this._paintBlur.set(drawPaint);
this._paintBlur.setAntiAlias(true);
this._paintBlur.setDither(true);
this._paintBlur.setStyle(Paint.Style.STROKE);
this._paintBlur.setStrokeJoin(Paint.Join.ROUND);
this._paintBlur.setStrokeCap(Paint.Cap.ROUND);
this._paintBlur.setColor(Color.RED);
this._paintBlur.setStrokeWidth(6);
this._paintBlur.setMaskFilter(new BlurMaskFilter(10.0F, BlurMaskFilter.Blur.OUTER));
}
public void setBackgroundResource(Drawable drawable){
setBackgroundResource(drawable);
}
/* public void setBackground(View view, Drawable background) {
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
view.setBackground(background);
} else {
view.setBackgroundDrawable(background);
}
}*/
public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
// setBackgroundResource(R.drawable.one);
}
@Override
protected void onDraw(Canvas canvas) {
for (Path p : paths) {
canvas.drawPath(p, drawPaint);
}
canvas.drawPath(drawPath, drawPaint);
// canvas.drawBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.one), 0, 0, canvasPaint);
// canvas.drawBitmap(canvasBitmap, 0, 0, canvasPaint);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
//create canvas of certain device size.
super.onSizeChanged(w, h, oldw, oldh);
//create Bitmap of certain w,h
canvasBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
//apply bitmap to graphic to start drawing.
drawCanvas = new Canvas(canvasBitmap);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float touchX = event.getX();
float touchY = event.getY();
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
touch_start(touchX, touchY);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touch_move(touchX, touchY);
invalidate();
break;
case MotionEvent.ACTION_UP:
touch_up();
invalidate();
break;
default:
return false;
}
return true;
}
private void touch_start(float x, float y) {
undonePaths.clear();
drawPath.reset();
drawPath.moveTo(x, y);
mX = x;
mY = y;
}
private void touch_up() {
drawPath.lineTo(mX, mY);
drawCanvas.drawPath(drawPath, drawPaint);
paths.add(drawPath);
drawPath = new Path();
}
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) {
drawPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
mX = x;
mY = y;
}
}
public void onClickUndo () {
if (paths.size()>0)
{
undonePaths.add(paths.remove(paths.size()-1));
invalidate();
}
}
仅错误部分：
2019-04-14 20:16:26.196 15300-15300/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.undopaint1, PID: 15300
java.lang.StackOverflowError: stack size 8MB
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
2019-04-14 20:16:26.200 15300-15300/? E/AndroidRuntime: at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
2019-04-14 20:16:26.560 15300-15314/? I/zygote64: Background concurrent copying GC freed 339(60KB) AllocSpace objects, 0(0B) LOS objects, 28% free, 58MB/82MB, paused 147.156ms total 517.058ms
, len = 6
2019-04-14 20:16:27.013 15300-15314/? I/zygote64: Background concurrent copying GC freed 528864(56MB) AllocSpace objects, 1(2MB) LOS objects, 30% free, 55MB/79MB, paused 398us total 280.785ms
2019-04-14 20:16:27.426 15300-15314/? I/zygote64: Background concurrent copying GC freed 528919(55MB) AllocSpace objects, 0(0B) LOS objects, 31% free, 52MB/76MB, paused 547us total 240.932ms
2019-04-14 20:16:27.579 15300-15300/? I/chatty: uid=10307(u0_a307) com.example.undopaint1 identical 3038 lines
2019-04-14 20:16:27.580 15300-15300/? E/AndroidRuntime: at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
2019-04-14 20:16:27.580 15300-15300/? E/AndroidRuntime: at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.CustomView.setBackgroundResource(CustomView.java:85)
at com.example.undopaint1.DrawView.onCreate(DrawView.java:44)
at android.app.Activity.performCreate(Activity.java:7383)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1218)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3256)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3411)
at android.app.ActivityThread.-wrap12(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1994)
at android.os.Handler.dispatchMessage(Handler.java:108)
at android.os.Looper.loop(Looper.java:166)
at android.app.ActivityThread.main(ActivityThread.java:7529)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:921)
2019-04-14 20:16:27.863 15300-15314/? I/zygote64: Background concurrent copying GC freed 484245(50MB) AllocSpace objects, 4(212KB) LOS objects, 25% free, 70MB/94MB, paused 430us total 263.626
如果它们是设置图像的替代方法，并且撤消逻辑不受影响，请以我不是专家的身份指导我。这是我第一次处理图像和自定义视图。
答案 0 :(得分：0)
处理图像的最佳方法是使用Piccasso
Picasso.get().load(path or url).into(imageView);
并且永远不要使用大图像作为背景！
从路径创建可绘制对象：
Drawable d = Drawable.createFromPath(pathName)
然后在将其设置为背景之前调整其大小
Bitmap bitmap = ((BitmapDrawable) d).getBitmap();
// Scale it to 50 x 50
Drawable d = newBitmapDrawable(getResources(),Bitmap.createScaledBitmap(bitmap,50, 50, true));