android - Getting Null pointer exception while saving the image to sd card

Question

I want to save an image into sd card.But only the folder naming the image file is created in the sd card,but the actual file is not being created in the sd card.I am getting null pointer exception while trying to save that image to sd card.This is the code:

public class MainActivity extends Activity {
    ImageView bmImage; 
    LinearLayout view1;
      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);

          view1 = (LinearLayout)findViewById(R.id.certlinear);
          bmImage = (ImageView)findViewById(R.id.certimage);

        Button button =(Button)findViewById(R.id.btn);
        button.setOnClickListener(hello);

    }
        Button.OnClickListener hello= new Button.OnClickListener()
        {  
            @Override  
            public void onClick(View v)
            {   
                  View view = view1.getRootView();
                  //u can use any view of your View instead of TextView

                 if(view!=null)
                 {
                 System.out.println("view is not null.....");
                 view.setDrawingCacheEnabled(true);
                 view.buildDrawingCache();
                 Bitmap bm = view.getDrawingCache();

                 try
                 {
                 if(bm!=null)
                 {
                 System.out.println("bm is not null.....");
                 OutputStream fos = null;
                 File folder = new File(Environment.getExternalStorageDirectory().toString() + "/sample.JPEG");
                 boolean success = false;
                 if (!folder.exists()) {
                     success = folder.mkdirs();
                 }
                 if (!success) {
                     // Do something on success
                 } else {
                     // Do something else on failure 
                 }
                 Toast.makeText(MainActivity.this,"path of the folder is "+folder.getAbsolutePath(), Toast.LENGTH_SHORT).show();

                 fos = new FileOutputStream(folder);

                 BufferedOutputStream bos = new BufferedOutputStream(fos);
                 bm.compress(Bitmap.CompressFormat.JPEG, 50, bos);

                 bos.flush();
                 bos.close();
                 view.setDrawingCacheEnabled(false);
                 }
                 }
                 catch(Exception e)
                 {
                 System.out.println("Error="+e);
                 e.printStackTrace();
                 }
                 }

            }
        };
}

This is the exception log:

09-13 18:44:18.957: W/System.err(3612): java.io.FileNotFoundException: /sdcard/sample.JPEG
09-13 18:44:18.967: W/System.err(3612):     at org.apache.harmony.luni.platform.OSFileSystem.open(OSFileSystem.java:244)
09-13 18:44:18.967: W/System.err(3612):     at java.io.FileOutputStream.<init>(FileOutputStream.java:97)
09-13 18:44:18.967: W/System.err(3612):     at java.io.FileOutputStream.<init>(FileOutputStream.java:69)
09-13 18:44:18.976: W/System.err(3612):     at com.example.mytest.MainActivity$1.onClick(MainActivity.java:96)
09-13 18:44:18.976: W/System.err(3612):     at android.view.View.performClick(View.java:2364)
09-13 18:44:18.976: W/System.err(3612):     at android.view.View.onTouchEvent(View.java:4179)
09-13 18:44:18.976: W/System.err(3612):     at android.widget.TextView.onTouchEvent(TextView.java:6541)
09-13 18:44:18.976: W/System.err(3612):     at android.view.View.dispatchTouchEvent(View.java:3709)
09-13 18:44:18.976: W/System.err(3612):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
09-13 18:44:18.987: W/System.err(3612):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
09-13 18:44:18.987: W/System.err(3612):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
09-13 18:44:18.987: W/System.err(3612):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
09-13 18:44:18.997: W/System.err(3612):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
09-13 18:44:18.997: W/System.err(3612):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
09-13 18:44:18.997: W/System.err(3612):     at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
09-13 18:44:18.997: W/System.err(3612):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
09-13 18:44:18.997: W/System.err(3612):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
09-13 18:44:18.997: W/System.err(3612):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-13 18:44:18.997: W/System.err(3612):     at android.os.Looper.loop(Looper.java:123)
09-13 18:44:18.997: W/System.err(3612):     at android.app.ActivityThread.main(ActivityThread.java:4363)
09-13 18:44:19.011: W/System.err(3612):     at java.lang.reflect.Method.invokeNative(Native Method)
09-13 18:44:19.011: W/System.err(3612):     at java.lang.reflect.Method.invoke(Method.java:521)
09-13 18:44:19.011: W/System.err(3612):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
09-13 18:44:19.011: W/System.err(3612):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
09-13 18:44:19.011: W/System.err(3612):     at dalvik.system.NativeStart.main(Native Method)

I am getting null pointer exception in this line:

   fos = new FileOutputStream(folder);

Thanks in advance.

Answer 1

Have you added this permission

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