我跟踪了[this] Android培训，了解如何在不耗尽已分配内存的情况下显示大型位图。我按照教程，我的代码没有错误。但是，当我打开应用程序进入应该加载大图像的活动时，我仍然会收到一条错误消息，说我的内存不足。
这是我的代码：
public class Map extends AppCompatActivity {
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
}
return inSampleSize;
}
public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId, int reqWidth, int reqHeight) {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(res, resId, options);
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
options.inJustDecodeBounds = false;
return BitmapFactory.decodeResource(res, resId, options);
}
public void touchMap() {
ImageView mapOverlay = (ImageView) findViewById(R.id.mapOverlay);
final Bitmap bitmap = ((BitmapDrawable) mapOverlay.getDrawable()).getBitmap();
mapOverlay.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
int pixel = bitmap.getPixel(x, y);
int redVal = Color.red(pixel);
int bluVal = Color.blue(pixel);
int greVal = Color.green(pixel);
int alpVal = Color.alpha(pixel);
Log.i("ColorTouch", redVal + ", " + bluVal + ", " + greVal + ", " + alpVal);
if (alpVal == 0) {
ImageView doNothing = (ImageView) findViewById(R.id.mapOverlay);
doNothing.setOnClickListener(null);
} else if (redVal == 255 && bluVal == 0 && greVal == 0 && alpVal == 255) {
ImageView openBed1 = (ImageView) findViewById(R.id.mapOverlay);
openBed1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent toBed1 = new Intent(Map.this, Bed1.class);
startActivity(toBed1);
}
});
} else if (redVal == 255 && bluVal == 255 && greVal == 0 && alpVal == 255) {
ImageView openBed2 = (ImageView) findViewById(R.id.mapOverlay);
openBed2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent toBed2 = new Intent(Map.this, Bed2.class);
startActivity(toBed2);
}
});
} else if (redVal == 0 && bluVal == 255 && greVal == 0 && alpVal == 255) {
ImageView openBed3 = (ImageView) findViewById(R.id.mapOverlay);
openBed3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent toBed3 = new Intent(Map.this, Bed3.class);
startActivity(toBed3);
}
});
} else if (redVal == 0 && greVal == 255 && bluVal == 255 && alpVal == 255) {
ImageView openBed4 = (ImageView) findViewById(R.id.mapOverlay);
openBed4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent toBed4 = new Intent(Map.this, Bed4.class);
startActivity(toBed4);
}
});
} else if (redVal == 0 && greVal == 255 && bluVal == 0 && alpVal == 255) {
ImageView openBed5 = (ImageView) findViewById(R.id.mapOverlay);
openBed5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent toBed5 = new Intent(Map.this, Bed5.class);
startActivity(toBed5);
}
});
} else if (redVal == 255 && greVal == 255 && bluVal == 0 && alpVal == 255) {
ImageView openBed6 = (ImageView) findViewById(R.id.mapOverlay);
openBed6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent toBed6 = new Intent(Map.this, Bed6.class);
startActivity(toBed6);
}
});
} else if (redVal == 0 && greVal == 0 && bluVal == 0 && alpVal == 255) {
ImageView openBed7 = (ImageView) findViewById(R.id.mapOverlay);
openBed7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent toBed7 = new Intent(Map.this, Bed7.class);
startActivity(toBed7);
}
});
} else if (redVal == 255 && greVal == 255 && bluVal == 255 && alpVal == 255) {
ImageView openBed8 = (ImageView) findViewById(R.id.mapOverlay);
openBed8.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent toBed8 = new Intent(Map.this, Bed8.class);
startActivity(toBed8);
}
});
} else if (redVal == 96 && greVal == 0 && bluVal == 255 && alpVal == 255) {
ImageView openBed9 = (ImageView) findViewById(R.id.mapOverlay);
openBed9.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent toBed9 = new Intent(Map.this, Bed8.class);
startActivity(toBed9);
}
});
}
return false;
}
});
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
touchMap();
Typeface serif = Typeface.createFromAsset(getAssets(), "fonts/Playfair.otf");
((Button) findViewById(R.id.buttonMapToHome)).setTypeface(serif);
Button goHome = (Button) findViewById(R.id.buttonMapToHome);
goHome.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent toHome = new Intent(Map.this, Home.class);
startActivity(toHome);
}
});
HorizontalScrollView horizontalScrollView = (HorizontalScrollView) findViewById(R.id.horizontalScrollView);
horizontalScrollView.setHorizontalScrollBarEnabled(false);
ImageView mImageView = new ImageView(this);
mImageView.setImageBitmap(decodeSampledBitmapFromResource(getResources(), R.id.map, 100, 100));
}
}
这是我的错误消息：
java.lang.OutOfMemoryError: Failed to allocate a 61054012 byte allocation with 16777216 free bytes and 26MB until OOM
at dalvik.system.VMRuntime.newNonMovableArray(Native Method)
at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:609)
at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:444)
at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:1080)
at android.content.res.Resources.loadDrawableForCookie(Resources.java:2635)
at android.content.res.Resources.loadDrawable(Resources.java:2540)
at android.content.res.TypedArray.getDrawable(TypedArray.java:870)
at android.widget.ImageView.<init>(ImageView.java:152)
at android.widget.ImageView.<init>(ImageView.java:140)
at android.support.v7.widget.AppCompatImageView.<init>(AppCompatImageView.java:58)
at android.support.v7.widget.AppCompatImageView.<init>(AppCompatImageView.java:54)
at android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:95)
at android.support.v7.app.AppCompatDelegateImplV7.createView(AppCompatDelegateImplV7.java:938)
at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(AppCompatDelegateImplV7.java:992)
at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:44)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:746)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
at org.havenseedsforsuccess.havenseedsforsuccess.Map.onCreate(Map.java:171)
at android.app.Activity.performCreate(Activity.java:6251)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)