[英]Issue converting Image Uri from gallery to bitmap Android
我是 android 新手,我在從圖像 uri 轉換為位圖然后在圖像視圖中顯示時遇到問題,但在轉換為位圖時遇到未處理的異常,這是代碼:
public class MainActivity extends AppCompatActivity {
public static final int PICK_IMAGE = 1;
Image picture = new Image();
Context context = getApplicationContext();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnGallery = (Button) findViewById(R.id.btnGallery);
final ImageView imageView = (ImageView) findViewById(R.id.imageView);
btnGallery.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE);
Uri imageUri = intent.getData();
Bitmap bitmap= MediaStore.Images.Media.getBitmap(context.getContentResolver(), imageUri);
imageView.setImageBitmap(bitmap);
}});
有什么建議么? 先謝謝了!
您沒有以正確的方式選擇圖像。 從您的onClick
方法中刪除這三行代碼,您會將它們移動到onActivityResult
:
Uri imageUri = intent.getData();
Bitmap bitmap =
MediaStore.Images.Media.getBitmap(context.getContentResolver(), imageUri);
imageView.setImageBitmap(bitmap);
然后在你的(可能) Activity
覆蓋onActivityResult
並在里面做這樣的事情:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE && resultCode == RESULT_OK && data != null) {
Uri imageUri = data.getData();
try {
Bitmap bitmap =
MediaStore.Images.Media.getBitmap(getContentResolver(), imageUri);
imageView.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
}
請嘗試此代碼,這適用於我的應用程序。
public void choosePhotoFromGallary() {
Intent galleryIntent = new Intent(Intent.ACTION_PICK,
MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(galleryIntent, GALLERY);
}
private void takePhotoFromCamera() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, CAMERA);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_CANCELED) {
return;
}
if (requestCode == GALLERY) {
if (data != null) {
Uri contentURI = data.getData();
try {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), contentURI);
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
// path = saveImage(bitmap);
imageView.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "Failed!", Toast.LENGTH_SHORT).show();
}
}
} else if (requestCode == CAMERA) {
Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
imageView.setImageBitmap(thumbnail);
path = saveImage(thumbnail);
}
}
public String saveImage(Bitmap myBitmap) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
File wallpaperDirectory = new File(
Environment.getExternalStorageDirectory() + IMAGE_DIRECTORY);
// have the object build the directory structure, if needed.
if (!wallpaperDirectory.exists()) {
wallpaperDirectory.mkdirs();
}
try {
File f = new File(wallpaperDirectory, Calendar.getInstance()
.getTimeInMillis() + ".jpg");
f.createNewFile();
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
MediaScannerConnection.scanFile(this,
new String[]{f.getPath()},
new String[]{"image/jpeg"}, null);
fo.close();
Log.d("TAG", "File Saved::--->" + f.getAbsolutePath());
return f.getAbsolutePath();
} catch (IOException e1) {
e1.printStackTrace();
}
return "";
}
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