加载图库的图片

 

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public class MainActivity extends Activity {     private ImageView lv;     private WindowManager wm;     private Point outSize;        @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         lv = (ImageView) this.findViewById(R.id.lv);         wm = (WindowManager) getSystemService(WINDOW_SERVICE);         outSize = new Point();     }        @Override     protected void onActivityResult(int requestCode, int resultCode, Intent data) {         Uri uri = data.getData();            try {             InputStream stream = getContentResolver().openInputStream(uri);                // 旧版的api             int windowHeight = wm.getDefaultDisplay().getHeight();             int windowWidth = wm.getDefaultDisplay().getWidth();                BitmapFactory.Options opts = new Options();             // 设置 不去真正的解析位图 不把他加载到内存 只是获取这个图片的宽高信息             opts.inJustDecodeBounds = true;             // BitmapFactory.decodeFile("/sdcard/a.jpg", opts);             BitmapFactory.decodeStream(stream, null, opts);                int width = opts.outWidth;             int height = opts.outWidth;             if (width > windowWidth || height > windowHeight) {                 int x = width / windowWidth;                 int y = height / windowHeight;                 opts.inSampleSize = x > y ? x : y;             } else {                    opts.inSampleSize = 1;             }             // 让位图工厂真正的去解析图片             opts.inJustDecodeBounds = false;             // 注意流的加载 需要重新加载流             stream = getContentResolver().openInputStream(uri);             Bitmap bitmap = BitmapFactory.decodeStream(stream, null, opts);             lv.setImageBitmap(bitmap);         } catch (Exception e) {             e.printStackTrace();         }            super.onActivityResult(requestCode, resultCode, data);     }        public void click(View view) {         Intent intent = new Intent();         intent.setAction("android.intent.action.PICK");         intent.addCategory("android.intent.category.DEFAULT");         intent.setType("image/*");         startActivityForResult(intent, 0);        }    }

 

 

来自为知笔记(Wiz)