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public class MainWangActivity extends Activity{

private static final String TAG = MainWangActivity.class.getName();

private ImageView imageView1,imageView2,imageView3;

/**

* 图片显示的宽度，这里为屏幕的宽度

*/

int width;

int heightFollwidth;

int imgW,imgH;

// InputStream inputStream;

int dealImgW1,dealImgH1;

int dealImgW2,dealImgH2;

int dealImgW3,dealImgH3;

Bitmap bitmap,dealBitmap1,dealBitmap2,dealBitmap3;

Rect rect1,rect2,rect3;

BitmapRegionDecoder bitmapRegionDecoder;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

DisplayMetrics metric = new DisplayMetrics();

getWindowManager().getDefaultDisplay().getMetrics(metric);

width = metric.widthPixels; // 屏幕宽度(像素)

System.out.println("屏幕width: " +width+"\ndip2px(this, 460): "+dip2px(this, 460));

setContentView(R.layout.main_wang);

Log.d(TAG, "1");

bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.longimg);

Log.d(TAG, "2"); // 1.4s

//inputStream = Bitmap2Is(bitmap);

imgW = bitmap.getWidth(); // 这个值是dp(=920),它大于图片实际像素宽px(=460)

imgH = bitmap.getHeight();

System.out.println("原始长图w: "+bitmap.getWidth()+"\n原始长图h: "+bitmap.getHeight());

imageView1 = (ImageView) findViewById(R.id.imageView1);

imageView2 = (ImageView) findViewById(R.id.imageView2);

imageView3 = (ImageView) findViewById(R.id.imageView3);

rect1 = new Rect(0, 0, imgW, imgH/3);

rect2 = new Rect(0, imgH/3, imgW, 2*imgH/3);

rect3 = new Rect(0, 2*imgH/3, imgW, 3*imgH/3);

try {

Log.d(TAG, "3"); // 0.004s

bitmapRegionDecoder = BitmapRegionDecoder.newInstance(Bitmap2Is(bitmap), false);

Log.d(TAG, "4"); // 1s

dealBitmap1 = bitmapRegionDecoder.decodeRegion(rect1, null);

dealBitmap2 = bitmapRegionDecoder.decodeRegion(rect2, null);

dealBitmap3 = bitmapRegionDecoder.decodeRegion(rect3, null);

Log.d(TAG, "5"); // 1.1s

if(dealBitmap1!=null&&dealBitmap2!=null&&dealBitmap3!=null){

Log.d(TAG, "6"); // 0.012s

dealImgW1 = dealBitmap1.getWidth();

dealImgH1 = dealBitmap1.getHeight();

dealImgW2 = dealBitmap2.getWidth();

dealImgH2 = dealBitmap2.getHeight();

dealImgW3 = dealBitmap3.getWidth();

dealImgH3 = dealBitmap3.getHeight();

heightFollwidth = width*dealImgH1/dealImgW1;

imageView1.setLayoutParams(new LinearLayout.LayoutParams(width, heightFollwidth));

imageView2.setLayoutParams(new LinearLayout.LayoutParams(width, heightFollwidth));

imageView3.setLayoutParams(new LinearLayout.LayoutParams(width, heightFollwidth));

imageView1.setImageBitmap(dealBitmap1);

imageView2.setImageBitmap(dealBitmap2);

imageView3.setImageBitmap(dealBitmap3);

Log.d(TAG, "7"); // 0.000s

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

这个是我使用bitmapRegionDecoder的代码