您好我正在尝试从图库中裁剪图像并将其显示在ImageView中。我在 fileUri 中得到NullPointerException。这里我包含了我的代码..请看看！
public class Details extends AppCompatActivity {
ImageView i1,i2;
private final static int REQUEST_PERMISSION_REQ_CODE = 34;
private static final int CAMERA_CODE = 101, GALLERY_CODE = 201, CROPING_CODE = 301;
private Uri mImageCaptureUri;
private File outPutFile = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_details);
android.support.v7.app.ActionBar ab = getSupportActionBar();
if (ab != null) {
ab.hide();
}
i1 = (ImageView)findViewById(R.id.prof1);
i2 = (ImageView)findViewById(R.id.prof2);
i1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
selectImageOption();
}
});
}
private void selectImageOption() {
final CharSequence[] items = { "Capture Photo", "Choose from Gallery", "Cancel" };
AlertDialog.Builder builder = new AlertDialog.Builder(Details.this);
builder.setTitle("Add Photo!");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (items[item].equals("Capture Photo")) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File f = new File(android.os.Environment.getExternalStorageDirectory(), "temp1.jpg");
mImageCaptureUri = Uri.fromFile(f);
intent.putExtra(MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
startActivityForResult(intent, CAMERA_CODE);
} else if (items[item].equals("Choose from Gallery")) {
Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, GALLERY_CODE);
} else if (items[item].equals("Cancel")) {
dialog.dismiss();
}
}
});
builder.show();
}
@Override
protected void onResume() {
super.onResume();
if (ContextCompat.checkSelfPermission(Details.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_PERMISSION_REQ_CODE);
return;
}
}
@Override
public void onRequestPermissionsResult(final int requestCode, final @NonNull String[] permissions, final @NonNull int[] grantResults) {
switch (requestCode) {
case REQUEST_PERMISSION_REQ_CODE: {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, "Permission granted.", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Permission denied.", Toast.LENGTH_SHORT).show();
}
break;
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == GALLERY_CODE && resultCode == RESULT_OK && null != data) {
mImageCaptureUri = data.getData();
System.out.println("Gallery Image URI : "+mImageCaptureUri);
CropingIMG();
} else if (requestCode == CAMERA_CODE && resultCode == Activity.RESULT_OK) {
System.out.println("Camera Image URI : "+mImageCaptureUri);
CropingIMG();
} else if (requestCode == CROPING_CODE) {
try {
if(outPutFile.exists()){
Bitmap photo = decodeFile(outPutFile);
i1.setImageBitmap(photo);
}
else {
Toast.makeText(getApplicationContext(), "Error while save image", Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
private void CropingIMG() {
final ArrayList<CropingOption> cropOptions = new ArrayList<CropingOption>();
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setType("image/*");
ArrayList<ResolveInfo> list =(ArrayList<ResolveInfo>)getPackageManager().queryIntentActivities( intent, 0 );
int size = list.size();
if (size == 0) {
Toast.makeText(this, "Cann't find image croping app", Toast.LENGTH_SHORT).show();
return;
} else {
intent.setData(mImageCaptureUri);
intent.putExtra("outputX", 512);
intent.putExtra("outputY", 512);
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("scale", true);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(outPutFile));
if (size == 1) {
Intent i = new Intent(intent);
ResolveInfo res = (ResolveInfo) list.get(0);
i.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
startActivityForResult(i, CROPING_CODE);
} else {
for (ResolveInfo res : list) {
final CropingOption co = new CropingOption();
co.title = getPackageManager().getApplicationLabel(res.activityInfo.applicationInfo);
co.icon = getPackageManager().getApplicationIcon(res.activityInfo.applicationInfo);
co.appIntent= new Intent(intent);
co.appIntent.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
cropOptions.add(co);
}
CropingOptionAdapter adapter = new CropingOptionAdapter(getApplicationContext(), cropOptions);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Choose Croping App");
builder.setCancelable(false);
builder.setAdapter( adapter, new DialogInterface.OnClickListener() {
public void onClick( DialogInterface dialog, int item ) {
// startActivityForResult( cropOptions.get(item).appIntent, CROPING_CODE);
CropingOption co =new CropingOption();
co=(CropingOption)cropOptions.get(item);
startActivityForResult(co.appIntent, CROPING_CODE);
}
});
builder.setOnCancelListener( new DialogInterface.OnCancelListener() {
@Override
public void onCancel( DialogInterface dialog ) {
if (mImageCaptureUri != null ) {
getContentResolver().delete(mImageCaptureUri, null, null );
mImageCaptureUri = null;
}
}
} );
AlertDialog alert = builder.create();
alert.show();
}
}
}
private Bitmap decodeFile(File f) {
try {
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
final int REQUIRED_SIZE = 512;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE || height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {
}
return null;
}
}
我也使用两个子类来裁剪图像..
public class CropingOptionAdapter extends ArrayAdapter {
private ArrayList mOptions;
private LayoutInflater mInflater;
public CropingOptionAdapter(Context context, ArrayList options) {
super(context, R.layout.cropping_selector, options);
mOptions = options;
mInflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup group) {
if (convertView == null)
convertView = mInflater.inflate(R.layout.cropping_selector, null);
CropingOption item = (CropingOption) mOptions.get(position);
if (item != null) {
((ImageView) convertView.findViewById(R.id.img_icon)).setImageDrawable(item.icon);
((TextView) convertView.findViewById(R.id.txt_name)).setText(item.title);
return convertView;
}
return null;
}
}
public class CropingOption {
public CharSequence title;
public Drawable icon;
public Intent appIntent;
}
我在文件中得到NullPointerException。而且我已经包含了我的错误..请看看
java.lang.RuntimeException：传递结果失败 ResultInfo {who = null，request = 201，result = -1，data = Intent { DAT =含量：//媒体/外部/图像/媒体/ 95419 typ = vnd.android.cursor.dir / image flg = 0x1}}到活动 {com.company/com.company.Details}：java.lang.NullPointerException： 文件
引起：java.lang.NullPointerException：file 在android.net.Uri.fromFile（Uri.java:452） 在com.companyname.Details.CropingIMG（Details.java:144） 在com.company.Details.onActivityResult（Details.java:109）
请看一下，任何人都会给我一个更好的解决方案。谢谢你提前