Question

Android缩放位图后图像质量不佳; 这是我使用动态壁纸应用程序的代码。有恒定的背景和我使用图像质量的多少，质量正在恶化。我需要更改以下代码中的图像质量？

请帮助你？

    import android.content.Context;
    import android.graphics.Bitmap;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.util.Log;
    import android.util.SparseArray;

public class BitmapManager {
private static final String TAG = BitmapManager.class.getSimpleName();
private static final boolean DEBUG = true;
private SparseArray<Bitmap> mData = new SparseArray<Bitmap>();
private static BitmapManager mInstance = null;
private static final Object mLock = new Object();
private Context mContext;



private BitmapManager(Context context) {
    mContext = context;
}

public static BitmapManager getInstance(Context context) {
    if (mInstance == null) {
        synchronized (mLock) {
            if (mInstance == null) {
                mInstance = new BitmapManager(context);
            }
        }
    }
    return mInstance;
}

public Bitmap getBitmap(int id) {
    return getBitmap(id, -1, -1);
}

/**
 * Not thread safe!
 */
public Bitmap getBitmap(int id, int scaleToWidth, int scaleToHeight) {
    String name;
    if (DEBUG) {
        name = mContext.getResources().getResourceName(id);
    }
    Bitmap b = mData.get(id);
    final boolean noScale = scaleToHeight == -1 || scaleToWidth == -1;
    if (DEBUG && noScale) {
        Log.v(TAG, "Scaling disabled.");
    }

    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inScaled = false;

    boolean bitmap_updated = true;

    if (b == null) {
        if (DEBUG) {
            Log.v(TAG, "Miss! Loading: "+name);
        }
        b = BitmapFactory.decodeResource(mContext.getResources(), id, options);
    } else if ((b.getWidth() > scaleToWidth || b.getHeight() > scaleToHeight) && !noScale) {
        b.recycle();
        if (DEBUG) {
            Log.v(TAG, "Size changed! Reloading: "+name);
        }
        b = BitmapFactory.decodeResource(mContext.getResources(), id, options);
    } else {
        if (DEBUG) {
            Log.v(TAG, "Skipping, bitmap already loaded");
        }
        bitmap_updated = false;
    }
    // Do scaling only if original bitmap is bigger than needed dimensions
    if ((b.getWidth() > scaleToWidth || b.getHeight() > scaleToHeight) && !noScale) {
        if (DEBUG) {
            Log.v(TAG, "Size does not match! Scaling.");
        }
        Bitmap scaled = Bitmap.createScaledBitmap(b, scaleToWidth, scaleToHeight, false);
        b.recycle();
        b = scaled;
    }

    if (bitmap_updated) {
        mData.put(id, b);
    }

    return b;
}

public void clear() {
    for(int i = 0; i < mData.size(); i++) {
        Bitmap b = mData.valueAt(i);
        b.recycle();
    }
    mData.clear();
}}

Answer 1

尝试options.inSampleSize = 2;而不是options.inScaled = false;

我遇到了与此相关的同样问题。

缩放位图后Android的图像质量不佳

1 个答案: