java– 使用Glide将位图加载到ImageView中

概述如何使用Glide库将Bitmap加载到我的ImageView中？我想用文本创建自定义图像,并使用Glide将其加载到imageview中.这是我用文本创建自定义位图的方法publicBitmapimageWithText(Stringtext){TextViewtv=newTextView(context);tv.setText(text);tv.setTextCo

如何使用GlIDe库将Bitmap加载到我的ImageVIEw中？
我想用文本创建自定义图像,并使用GlIDe将其加载到imagevIEw中.

这是我用文本创建自定义位图的方法

public Bitmap imageWithText(String text) {    TextVIEw tv = new TextVIEw(context);    tv.setText(text);    tv.setTextcolor(color.WHITE);    tv.setBackgroundcolor(color.BLACK);    tv.setTypeface(null, Typeface.BolD);    tv.setGravity(Gravity.CENTER);    tv.setTextSize(20);    tv.setpadding(0, 25, 0, 0);    Bitmap testB = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);    Canvas c = new Canvas(testB);    tv.layout(0, 0, 100, 100);    tv.draw(c);    return testB;}

但是,当我尝试使用滑动加载此位图时,我收到错误

GlIDe.with(getContext()).load(imageWithText("Random text")).into(holder.imgPhoto);

解决方法:

@rookiedev is right, there’s no load(Bitmap) in Glide,原因是：获取位图通常需要时间,有时会阻塞I / O.因此,在UI线程上调用imageWithText并不是一个好习惯.更新：据说我一段时间提出了this feature;虽然黑客更容易做,你可以在下面找到“滑行方式”,我强烈推荐.

GlIDe的设计灵活,这个问题表明这种特性非常好.以下实现可能看起来很长,但所有部分都有其存在的理由.鉴于性能提升,适合您的生成器进入GlIDe世界的代码数量并不多.我试图将其格式化为简短,折叠不相关的部分并使用静态导入更短(请参阅导入的结尾).

该代码还包括以编程方式生成的UI,因此您只需将以下所有代码复制粘贴到GlIDeGeneratedImageListFragment.java中并运行它;唯一的外部依赖是支持lib的RecyclerVIEw.

class GeneratingAdapter extends RecyclerVIEw.Adapter<RecyclerVIEw.VIEwHolder> {    // See https://docs.Google.com/drawings/d/1KyOJkNd5Dlm8_awZpftzW7KtqgNR6GURvuF6RfB210g/edit?usp=sharing    //                                  ModelType/A,    DataType/T,     ResourceType/Z, TranscodeType/R    private final GenericRequestBuilder<GenerateParams, GenerateParams, Bitmap,         GlIDeDrawable> generator;    public GeneratingAdapter(final Context context) {        generator = GlIDe // this part should be cleaner in GlIDe 4.0, but that's not released yet        .with(context)        .using(new GenerateParamsPassthroughModelLoader(), GenerateParams.class)          // custom class        .from(GenerateParams.class)        .as(Bitmap.class)        .transcode(new BitmapToGlIDeDrawableTranscoder(context), GlIDeDrawable.class)     // builtin        .decoder(new GenerateParamsBitmapResourceDecoder(context))                        // custom class        .encoder(new BitmapEncoder(Bitmap.CompressFormat.PNG, 0/*ignored for lossless*/)) // builtin        .cacheDecoder(new fileToStreamDecoder<Bitmap>(new StreamBitmapDecoder(context)))  // builtin        //.placeholder(new colorDrawable(color.YELLOW)) // you can pre-set placeholder and error        .error(new colorDrawable(color.RED))            // so it's easIEr when binding        //.diskCacheStrategy(diskCacheStrategy.NONE)    // only for deBUGging to always regenerate        //.skipMemoryCache(true)                        // only for deBUGging to always regenerate        ;    }    @OverrIDe public int getItemCount() { return 1000; }    private final float[] colorCache = new float[] {0, 1.0f, 0.5f};    private final float[] bgCache = new float[] {0, 0.5f, 1.0f};    @OverrIDe public voID onBindVIEwHolder(RecyclerVIEw.VIEwHolder holder, int position) {        colorCache[0] = bgCache[0] = (position * 15) % 360; // just to have a fancy example :)        GenerateParams params = new GenerateParams(                // omit position to see GlIDe caching in action (every 24th item / 12th row is the same)                "androID text"/* + " #" + position*/,                color.HSVTocolor(colorCache),                color.HSVTocolor(bgCache)        );        generator/*.clone() in case you see weird behavior*/.load(params).into((ImageVIEw)holder.itemVIEw);    }    @OverrIDe public RecyclerVIEw.VIEwHolder onCreateVIEwHolder(VIEwGroup parent, int vIEwType) {        int height = parent.getContext().getResources().getdisplayMetrics().heightPixels / 3;        ImageVIEw vIEw = new ImageVIEw(parent.getContext());        vIEw.setLayoutParams(new RecyclerVIEw.LayoutParams(MATCH_PARENT, height));        vIEw.setScaleType(ImageVIEw.ScaleType.FIT_CENTER);        return new RecyclerVIEw.VIEwHolder(vIEw) {}; // anon class for brevity    }}public class GlIDeGeneratedImageListFragment extends Fragment {    @OverrIDe public @Nullable VIEw onCreateVIEw(LayoutInflater inflater, VIEwGroup container, Bundle savedInstanceState) {        RecyclerVIEw vIEw = new RecyclerVIEw(container.getContext());        vIEw.setLayoutParams(new marginLayoutParams(MATCH_PARENT, MATCH_PARENT));        vIEw.setLayoutManager(new GrIDLayoutManager(container.getContext(), 2 /*columns*/));        vIEw.setAdapter(new GeneratingAdapter(vIEw.getContext()));        return vIEw;    }}/** Extracted params from imageWithText, but left some hardcoded values like 20sp/bold/center in {@link Generators}. */class GenerateParams {    final String text;    final int color;    final int background;    public GenerateParams(String text, int color, int bg) {        this.text = text;        this.color = color;        this.background = bg;    }    public String getID() {        // Todo make sure it's unique for every possible instance of GenerateParams        // because it will affect how the resulting bitmap is cached        // the below is correct correct for the current fIElds, if those change this has to change        return String.format(Locale.ROOT, "%s-%08x-%08x", text, color, background);    }}/** Boilerplate because of the degeneration in ModelType == DataType, but important for caching. *  @see GeneratingAdapter#generator */class GenerateParamsPassthroughModelLoader implements ModelLoader<GenerateParams, GenerateParams> {    @OverrIDe public DataFetcher<GenerateParams> getResourceFetcher(final GenerateParams model, int wIDth, int height) {        return new DataFetcher<GenerateParams>() {            @OverrIDe public GenerateParams loadData(Priority priority) throws Exception { return model; }            @OverrIDe public voID cleanup() { }            @OverrIDe public String getID() { return model.getID(); }            @OverrIDe public voID cancel() { }        };    }}/** Handles pooling to reduce/prevent GC lagging from too many {@link Bitmap#createBitmap}s */class GenerateParamsBitmapResourceDecoder implements ResourceDecoder<GenerateParams, Bitmap> {    private final Context context;    public GenerateParamsBitmapResourceDecoder(Context context) { this.context = context; }    @OverrIDe public Resource<Bitmap> decode(GenerateParams source, int wIDth, int height) throws IOException {        BitmapPool pool = GlIDe.get(context).getBitmapPool();        Bitmap bitmap = pool.getDirty(wIDth, height, Bitmap.Config.ARGB_8888);        if (bitmap == null) {            bitmap = Bitmap.createBitmap(wIDth, height, Bitmap.Config.ARGB_8888);        }        Generators.imageWithTextNolayout(context, bitmap, source);        return BitmapResource.obtain(bitmap, pool);    }    @OverrIDe public String getID() {        // be careful if you change the Generator implementation you have to change this        // otherwise the users may see a cached image; or clear cache on app update        return "com.example.MyImageGenerator";    }}class Generators {    /** OP's original implementation fixed for real centering */    public static Bitmap imageWithText(Context context, Bitmap bitmap, GenerateParams params) {        TextVIEw vIEw = new TextVIEw(context);        vIEw.setText(params.text);        vIEw.setTextcolor(params.color);        vIEw.setBackgroundcolor(params.background);        vIEw.setTypeface(null, Typeface.BolD);        vIEw.setGravity(Gravity.CENTER);        vIEw.setTextSize(20 /*sP*/);        Canvas canvas = new Canvas(bitmap);        vIEw.measure(makeMeasureSpec(canvas.getWIDth(), EXACTLY), makeMeasureSpec(canvas.getHeight(), EXACTLY));        vIEw.layout(0, 0, canvas.getWIDth(), canvas.getHeight());        vIEw.draw(canvas);        return bitmap;    }    /** Generate centered text without creating a VIEw, more lightweight.     * ConsIDer https://stackoverflow.com/a/8369690/253468 for multiline support. */    public static Bitmap imageWithTextNolayout(Context context, Bitmap bitmap, GenerateParams params) {        Paint paint = new Paint();        paint.setcolor(params.color);        paint.setTextAlign(Paint.Align.CENTER); // text's anchor for the x given in drawText        paint.setTextSize(applyDimension(COMPLEX_UNIT_SP, 20, context.getResources().getdisplayMetrics()));        paint.setTypeface(Typeface.DEFAulT_BolD);        Canvas canvas = new Canvas(bitmap);        canvas.drawcolor(params.background);        canvas.drawText(params.text, canvas.getWIDth() / 2, canvas.getHeight() / 2, paint);        return bitmap;    }}// Here are the imports in case you need it;// dIDn't want to put it in the beginning to keep the relevant code first.import java.io.IOException;import java.util.Locale;import androID.content.Context;import androID.graphics.*;import androID.graphics.drawable.colorDrawable;import androID.os.Bundle;import androID.support.annotation.Nullable;import androID.support.v4.app.Fragment;import androID.support.v7.Widget.*;import androID.vIEw.*;import androID.vIEw.VIEwGroup.marginLayoutParams;import androID.Widget.*;import static androID.util.TypedValue.*;import static androID.vIEw.VIEw.MeasureSpec.*;import static androID.vIEw.VIEwGroup.LayoutParams.*;import com.bumptech.glIDe.*;import com.bumptech.glIDe.load.ResourceDecoder;import com.bumptech.glIDe.load.data.DataFetcher;import com.bumptech.glIDe.load.engine.Resource;import com.bumptech.glIDe.load.engine.bitmap_recycle.BitmapPool;import com.bumptech.glIDe.load.model.ModelLoader;import com.bumptech.glIDe.load.resource.bitmap.*;import com.bumptech.glIDe.load.resource.drawable.GlIDeDrawable;import com.bumptech.glIDe.load.resource.file.fileToStreamDecoder;import com.bumptech.glIDe.load.resource.transcode.BitmapToGlIDeDrawableTranscoder;

这是它的样子(实际滚动更顺畅,GIF真的很低FPS)：

注意它如何加载前几个项目然后逐渐加载其余项目.内存缓存和池预热需要一点点,但如果你想要更平滑的显示,你可以使用预加载器.它热身后滚动得很好. *** 作栏上的删除按钮调用GlIDe.cleardiskCache()和GlIDe.clearMemory(),以便它再次开始重新生成项目.

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