如何在图像视图中加载从另一个活动中的摄像头捕获的图片？

Question

我有两个图像按钮，一个用于从画廊拍摄照片并将其显示在其他活动中。这工作正常。它以高质量显示照片。但是，当我尝试从相机拍摄照片，然后将该照片显示在另一个活动中时，会显示错误。这里是我的代码 MainActivity.java：

private static final int REQUEST_CAMERA = 1; 
private static int SELECT_FILE = 1; 
public static Uri selectedImageURI; 

if (take_photo != null) { 
     take_photo.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
       startActivityForResult(intent,REQUEST_CAMERA); 

      } 
     }); 
    } 
    //to get the photo from gallery 
    if (get_photo != null) { 
     get_photo.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Intent i = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI); 
       startActivityForResult(i,SELECT_FILE); 


} 

if (resultCode == RESULT_OK) { 
     if (requestCode == SELECT_FILE) { 
      selectedImageURI = data.getData(); 
      File imageFile = new File(getRealPathFromURI(selectedImageURI)); 
      Intent intent = new Intent(this, ShowPhotoActivity.class); 
      intent.putExtra("imagePath", imageFile.toString()); 
      startActivity(intent);} 
     else if (requestCode != RESULT_CANCELED) 
     { 
      if(requestCode == REQUEST_CAMERA){ 
       Uri selectImageURI = data.getData(); 
       File imgFile = new File(getRealPathFromURI(selectImageURI)); 
       Intent i = new Intent(this,ShowPhotoActivity.class); 
       i.putExtra("imagePath",imgFile.toString()); 
       startActivity(i); 

      } 
     } }} 
     private String getRealPathFromURI(Uri contentURI){ 
      String result; 
      Cursor cursor = getContentResolver().query(contentURI,null,null,null,null); 
      if(cursor == null){ 
       result = contentURI.getPath(); 

      }else { 
       cursor.moveToFirst(); 
       int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); 
       result = cursor.getString(idx); 
       cursor.close(); 
      } 
     return result; 
    } 

showPhotoActivity.java：

String image_path = getIntent().getStringExtra("imagePath"); 
Bundle extras = getIntent().getExtras(); 
Uri uri = Uri.parse(extras.getString("imagePath")); 

    if (showPhoto != null) { 

     Bitmap bm = BitmapFactory.decodeFile(uri.getPath()); 
     showPhoto.setImageBitmap(bm); 
    } 

的manifest.xml

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 

<uses-feature android:name="android.hardware.camera" /> 

的logcat：

java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { act=inline-data (has extras) }} to activity {com.example.gentaliu.photoeditor/com.example.gentaliu.photoeditor.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getScheme()' on a null object reference 
                        at android.app.ActivityThread.deliverResults(ActivityThread.java:3840) 
                        at android.app.ActivityThread.handleSendResult(ActivityThread.java:3883) 
                        at android.app.ActivityThread.access$1700(ActivityThread.java:165) 
                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1426) 
                        at android.os.Handler.dispatchMessage(Handler.java:102) 
                        at android.os.Looper.loop(Looper.java:135) 
                        at android.app.ActivityThread.main(ActivityThread.java:5593) 
                        at java.lang.reflect.Method.invoke(Native Method) 
                        at java.lang.reflect.Method.invoke(Method.java:372) 
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960) 
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 
                       Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getScheme()' on a null object reference 
                        at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1477) 
                        at android.content.ContentResolver.query(ContentResolver.java:473) 
                        at android.content.ContentResolver.query(ContentResolver.java:426) 
                        at com.example.ga.photoeditor.MainActivity.getRealPathFromURI(MainActivity.java:96) 
                        at com.example.ga.photoeditor.MainActivity.onActivityResult(MainActivity.java:69) 
                        at android.app.Activity.dispatchActivityResult(Activity.java:6320) 
                        at android.app.ActivityThread.deliverResults(ActivityThread.java:3836) 
                        at android.app.ActivityThread.handleSendResult(ActivityThread.java:3883)  
                        at android.app.ActivityThread.access$1700(ActivityThread.java:165)  
                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1426)  
                        at android.os.Handler.dispatchMessage(Handler.java:102)  
                        at android.os.Looper.loop(Looper.java:135)  
                        at android.app.ActivityThread.main(ActivityThread.java:5593)  
                        at java.lang.reflect.Method.invoke(Native Method)  
                        at java.lang.reflect.Method.invoke(Method.java:372)  
                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)  
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)  

09-16 00 ：46：51.149 27066-27066/c om.example.ga.photoeditor I/Process：发送信号。 PID：27066 SIG：9

Answer 1

private static final int REQUEST_CAMERA = 1; 
private static int SELECT_FILE = 1; 
public static Uri selectedImageURI; 

if (take_photo != null) { 
     take_photo.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
       startActivityForResult(intent,REQUEST_CAMERA); 
      } 
     }); 
    } 

    //to get the photo from gallery 
    if (get_photo != null) { 
     get_photo.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Intent i = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI); 
       startActivityForResult(i,SELECT_FILE); 
     } 
    }); 
} 


@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
if (resultCode == RESULT_OK) { 
     if (requestCode == SELECT_FILE) { 
      selectedImageURI = data.getData(); 
      File imageFile = new File(getRealPathFromURI(selectedImageURI)); 
      Intent intent = new Intent(this, ShowPhotoActivity.class); 
      intent.putExtra("imagePath", imageFile.toString()); 
      startActivity(intent); 
      } 

     else if(requestCode == REQUEST_CAMERA){ 
      Bitmap bitmapImage = (Bitmap) intent.getExtras().get("data"); 
      Intent i= new Intent(this,ShowPhotoActivity.class); 
      i.putExtra("bitmap", bitmapImage); 
      startActivity(i); 

}else{ 
     //do something 
     } 
} 

private String getRealPathFromURI(Uri contentURI){ 
      String result; 
      Cursor cursor = getContentResolver().query(contentURI,null,null,null,null); 
      if(cursor == null){ 
       result = contentURI.getPath(); 

      }else { 
       cursor.moveToFirst(); 
       int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); 
       result = cursor.getString(idx); 
       cursor.close(); 
      } 
     return result; 
    } 

和检索相机的位图图像在第二活动：

private void getData(){ 

    Intent intent = getIntent(); 
    Bitmap bitmap = (Bitmap) intent.getParcelableExtra("Bitmap"); 
    img.setImageBitmap(bitmap); 

}