Android中加载一张大图片Caused by: java.lang.OutOfMemoryError

Bitmap bitmap= BitmapFactory.decodeFile("/sdcard/a.jpg");    iv.setImageBitmap(bitmap);

在android中要加载一张大图片到内存中，会抛出内存溢出异常Caused by: java.lang.OutOfMemoryError。

正确的做法应该是这样的：

public class MainActivity extends Activity {    private ImageView iv;    private int windowHeight;    private int windowWidth;     @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        iv = (ImageView) findViewById(R.id.iv);        WindowManager win = (WindowManager) getSystemService(WINDOW_SERVICE);        windowHeight = win.getDefaultDisplay().getHeight();        windowWidth = win.getDefaultDisplay().getWidth();    }     @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }     public void load(View view) {             /*   Bitmap bitmap= BitmapFactory.decodeFile("/sdcard/a.jpg");         iv.setImageBitmap(bitmap);*/                  // 图片解析的配置        BitmapFactory.Options options = new Options();        // 不去真的解析图片，只是获取图片的头部信息宽，高        options.inJustDecodeBounds = true;        BitmapFactory.decodeFile("/sdcard/a.jpg", options);        int imageHeight = options.outHeight;        int imageWidth = options.outWidth;        // 计算缩放比例        int scaleX = imageWidth / windowWidth;        int scaleY = imageHeight / windowHeight;        int scale = 1;        if (scaleX > scaleY & scaleY >= 1) {            scale = scaleX;         }else if (scaleY > scaleX & scaleX >= 1) {            scale = scaleY;         }        //真的解析图片        options.inJustDecodeBounds=false;        //设置采样率        options.inSampleSize=scale;        Bitmap bitmap=BitmapFactory.decodeFile("/sdcard/a.jpg", options);        iv.setImageBitmap(bitmap);    } }

xml配置

在这种情况下，是将大分辨率的图片按照一定的比例缩小然后加载进内存，就不会出现内存溢出的现象了。

转自： https://www.2cto.com/kf/201404/293670.html

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