捕獲一個圖像，並將其傳遞給另一個活動在android

Question

我已經經歷了類似的答案，我想到的是我試圖編碼我的第一個應用程序。 現在我遇到了錯誤。

我有一個活性，其的onclick調用一個方法（在相應的類中定義）

此方法調用相機，捕捉圖像並將其發送到另一個活動用於顯示的ImageView的。 當我嘗試在捕獲它的同一活動中顯示圖像時，它只是正常工作 但是當我嘗試通過意圖傳遞它時，它會給我錯誤和錯誤。

這裏是我的代碼 活性1（fragment_selfin_review.xml）

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
tools:context="com.ardortech.restofun.SelfinReview$PlaceholderFragment" 
android:background="@color/black" 
> 
    <ImageView 
    android:id="@+id/click_selfie" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@id/blank_space" 
    android:layout_centerHorizontal="true" 
    android:contentDescription="@string/click_selfie" 
    android:gravity="center" 
    android:src="@drawable/ic_camera" 
    android:clickable="true" 
    android:onClick="clickSelfie" /> 
</RelativeLayout> 

這裏是java類

package com.mysite.myapp; 

    import java.io.ByteArrayOutputStream; 
    import java.io.File; 

    import android.app.Activity; 
    import android.content.ContentResolver; 
    import android.content.Intent; 
    import android.graphics.Bitmap; 
    import android.net.Uri; 
    import android.os.Bundle; 
    import android.os.Environment; 
    import android.provider.MediaStore; 
    import android.support.v4.app.Fragment; 
    import android.support.v7.app.ActionBarActivity; 
    import android.view.LayoutInflater; 
    import android.view.Menu; 
    import android.view.MenuItem; 
    import android.view.View; 
    import android.view.ViewGroup; 
    import android.widget.Toast; 
    public class SelfinReview extends ActionBarActivity { 
    public static final int TAKE_PICTURE = 0; 
    private Uri mUri; 
    private Bitmap mPhoto; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_selfin_review); 

     if (savedInstanceState == null) { 
      getSupportFragmentManager().beginTransaction() 
      .add(R.id.container, new PlaceholderFragment()).commit(); 
     } 
    } 
    /** Code for onclick Camera Image Method 
    * 
    */ 

    public void clickSelfie(View v){ 

     Intent i = new Intent("android.media.action.IMAGE_CAPTURE"); 

     File f = new File(Environment.getExternalStorageDirectory(), "photo.jpg"); 
     i.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f)); 
     mUri = Uri.fromFile(f); 
     startActivityForResult(i, TAKE_PICTURE); 
    } 

    @Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
      super.onActivityResult(requestCode, resultCode, data); 


      switch (requestCode) { 
      case TAKE_PICTURE: 
       if (resultCode == Activity.RESULT_OK) { 
      getContentResolver().notifyChange(mUri, null); 
        ContentResolver cr = getContentResolver(); 
        try { 
         Intent selfiSrc = new Intent(this,SelfiEdit.class); 
         selfiSrc.putExtra("imgurl", mUri.toString()); 
         startActivity(selfiSrc); 

        } catch (Exception e) { 
         Toast.makeText(this, e.getMessage(),Toast.LENGTH_SHORT).show(); 
         } 

       } 
      } 
    } 

     /** 
    * A placeholder fragment containing a simple view. 
    */ 
    public static class PlaceholderFragment extends Fragment { 

     public PlaceholderFragment() { 
     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
      View rootView = inflater.inflate(R.layout.fragment_selfin_review, 
        container, false); 
      return rootView; 
     } 
    }  


    } 

以及接收活動的代碼，我在這裏如何讓我的意圖

@Override 
    protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_selfi_edit); 
     if (savedInstanceState == null) { 
      getSupportFragmentManager().beginTransaction() 
     .add(R.id.container, new PlaceholderFragment()).commit(); 
     } 
    /** 
    * Receiving image data from the Previous activity 
    */ 
     ImageView previewThumbnail = (ImageView) findViewById(R.id.selfie_holder); 
     String rcvimgpath=getIntent().getStringExtra("imgurl"); 
     previewThumbnail.setImageBitmap(BitmapFactory.decodeFile(rcvimgpath)); 

    } 

但是當我運行時，我得到這個錯誤就像

06-19 08:38:25.108: D/(1112): HostConnection::get() New Host Connection established 
    0xb8eae210, tid 1112 
    06-19 08:38:25.238: W/EGL_emulation(1112): eglSurfaceAttrib not implemented 
    06-19 08:38:25.288: D/OpenGLRenderer(1112): Enabling debug mode 0 
    06-19 08:38:28.438: W/EGL_emulation(1112): eglSurfaceAttrib not implemented 
    06-19 08:38:44.078: W/EGL_emulation(1112): eglSurfaceAttrib not implemented 
    06-19 08:38:44.668: E/BitmapFactory(1112): Unable to decode stream: 
    java.io.FileNotFoundException: /file:/storage/sdcard/photo.jpg: open failed: ENOENT (No 
    such file or directory) 
    06-19 08:38:44.758: D/AndroidRuntime(1112): Shutting down VM 
    06-19 08:38:44.758: W/dalvikvm(1112): threadid=1: thread exiting with uncaught 
    exception (group=0xb4a3fba8) 
    06-19 08:38:45.018: E/AndroidRuntime(1112): FATAL EXCEPTION: main 
    06-19 08:38:45.018: E/AndroidRuntime(1112): Process: com.mysite.myapp, PID: 1112 
    06-19 08:38:45.018: E/AndroidRuntime(1112): java.lang.RuntimeException: Unable to start 
    activity ComponentInfo{com.mysite.myapp/com.mysite.myapp.SelfiEdit}: 
    java.lang.NullPointerException 
    06-19 08:38:45.018: E/AndroidRuntime(1112):at 
    android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    android.app.ActivityThread.access$800(ActivityThread.java:135) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    android.os.Handler.dispatchMessage(Handler.java:102) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    android.os.Looper.loop(Looper.java:136) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    android.app.ActivityThread.main(ActivityThread.java:5017) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    java.lang.reflect.Method.invokeNative(Native Method) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    java.lang.reflect.Method.invoke(Method.java:515) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    dalvik.system.NativeStart.main(Native Method) 
    06-19 08:38:45.018: E/AndroidRuntime(1112): Caused by: java.lang.NullPointerException 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    com.mysite.myapp.SelfiEdit.onCreate(SelfiEdit.java:47) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    android.app.Activity.performCreate(Activity.java:5231) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
    06-19 08:38:45.018: E/AndroidRuntime(1112):  at 
    android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 

我試圖在它被捕獲的同一個活動中顯示圖像，並且像魅力一樣工作。但是在將圖片網址傳遞給其他活動時出現錯誤。

任何人都可以指出我是怎麼回事？ 由於

Answer 1

更改clickSelfie方法這樣

public void clickSelfie() { 
    Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
    startActivityForResult(cameraIntent, TAKE_PICTURE); 
} 

onactivityResult這樣

@Override 
public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 

    if (requestCode == TAKE_PICTURE && resultCode == RESULT_OK) { 
     Uri u = data.getData(); 
     Intent selfiSrc = new Intent(this, SelfiEdit.class); 
    selfiSrc.putExtra("imgurl", u); 
    startActivity(selfiSrc); 
    } 

}

和接收活動的onCreate這樣

Bundle extras= getIntent().getExtras(); 
if(extras!=null) 
{ 
    path = (Uri) extras.get("imgurl"); 
} 
ImageView img = (ImageView)findViewById(R.id.click_selfie); 
img.setImageURI(path); 

它的工作原理就像一個魅力在我的設備

this can help you more for wide number of devices