第一个文件允许用户从gallery中选择一个图片,然后把图片传到一个activity中处理。问题是图像相对于手机屏幕来说太大了,所以只能看见图像的左上角,就像图像是被放大的。
Button useGallery = (Button)findViewById(R.id.loadfromgallery);
useGallery.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, SELECT_PHOTO);
}}) ;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
switch(requestCode) {
case SELECT_PHOTO:
if(resultCode == RESULT_OK){
Uri selectedImage = imageReturnedIntent.getData();
InputStream imageStream = null;
try {
imageStream = getContentResolver().openInputStream(selectedImage);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Bitmap yourSelectedImage = BitmapFactory.decodeStream(imageStream);
Intent intent = new Intent(mContext, DisplayUndistortedBitmapFromGalleryActivity.class);
intent.setData(selectedImage);
startActivity(intent);
if(yourSelectedImage != null){
Log.e(TAG,"pic ok");
}else{
Log.e(TAG,"pic not ok");
}
}
}
第二个文件是activity,从intent中接收到图片图像数据,然后把它放置在一个包含bitmap的URI中。
public class DisplayUndistortedBitmapFromGalleryActivity extends Activity {
private static final String TAG = "*********DUBFGActivity";
private Context mContext = this;
Uri uri;
private Bitmap mbitmap = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
uri = getIntent().getData();
if(uri != null){
Log.e(TAG, "uri ok");
}else {
Log.e(TAG, "uri not ok");
}
try {
mbitmap = Media.getBitmap(getContentResolver(), uri);
//setMbitmap(bitmap);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
第三个文件是activity的customview。下面这一行从activity中检索出bitmap并显示它。是否有精简bitmap的方法,让它符合屏幕的大小?
Bitmap bm = ((DisplayUndistortedBitmapFromGalleryActivity)getContext()).getMbitmap();