Question

When I call this Record.java class via Intent from another class and then click on the button1, i get a forced close exception. I want to know why this is happening. Also, the logcat says something like device disconnected “unable to create media player”

The code is:

public class Record extends Activity{
    Button btn1,btn2;
    MediaRecorder recorder;
     public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.record);
            btn1=(Button)findViewById(R.id.button1);
            btn2=(Button)findViewById(R.id.button2);
            btn1.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    recorder = new MediaRecorder();

                    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
                    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
                    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
                    recorder.setOutputFile("/sdcard/sample.3gp");


                    try {
                        recorder.prepare();
                        recorder.start();
                    } catch (IllegalStateException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            });
            btn2.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    recorder.stop();
                    recorder.reset();
                    recorder.release();

                    recorder = null;
                }
            });
     }

}

Here is the logcat output

  07-05 10:20:07.598: E/AndroidRuntime(841): Uncaught handler: thread main exiting due to uncaught exception
07-05 10:20:07.609: E/AndroidRuntime(841): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.newaa/com.example.newaa.Recipient}: java.lang.IndexOutOfBoundsException: charAt: -1 < 0
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.app.ActivityThread.access$2200(ActivityThread.java:119)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.os.Handler.dispatchMessage(Handler.java:99)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.os.Looper.loop(Looper.java:123)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.app.ActivityThread.main(ActivityThread.java:4363)
07-05 10:20:07.609: E/AndroidRuntime(841):  at java.lang.reflect.Method.invokeNative(Native Method)
07-05 10:20:07.609: E/AndroidRuntime(841):  at java.lang.reflect.Method.invoke(Method.java:521)
07-05 10:20:07.609: E/AndroidRuntime(841):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
07-05 10:20:07.609: E/AndroidRuntime(841):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
07-05 10:20:07.609: E/AndroidRuntime(841):  at dalvik.system.NativeStart.main(Native Method)
07-05 10:20:07.609: E/AndroidRuntime(841): Caused by: java.lang.IndexOutOfBoundsException: charAt: -1 < 0
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.text.SpannableStringBuilder.charAt(SpannableStringBuilder.java:110)
07-05 10:20:07.609: E/AndroidRuntime(841):  at com.example.newaa.Recipient$2.onTextChanged(Recipient.java:76)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.widget.TextView.setText(TextView.java:2687)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.widget.TextView.setText(TextView.java:2552)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.widget.EditText.setText(EditText.java:71)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.widget.TextView.setText(TextView.java:2527)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.widget.TextView.onRestoreInstanceState(TextView.java:2427)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.view.View.dispatchRestoreInstanceState(View.java:5940)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:1127)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:1127)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.view.View.restoreHierarchyState(View.java:5919)
07-05 10:20:07.609: E/AndroidRuntime(841):  at com.android.internal.policy.impl.PhoneWindow.restoreHierarchyState(PhoneWindow.java:1454)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.app.Activity.onRestoreInstanceState(Activity.java:835)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.app.Activity.performRestoreInstanceState(Activity.java:807)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1096)
07-05 10:20:07.609: E/AndroidRuntime(841):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2473)

Answer 1

Your problem is in com.example.newaa.Recipient class.
see this line number. at com.example.newaa.Recipient$2.onTextChanged(Recipient.java:76)
Hope you will find problem or post the code of your Recipient.java