setContentView有问题

时间:2011-12-26 18:28:57

标签: android

我正在尝试执行此应用程序:http://developer.android.com/guide/topics/media/audio-capture.html

我的问题是,当我评论行setContentView(ll);一切都很好,但应用程序没有做任何事情。当我解除该行时,它会出现两个buttoms但是当我推动其中一个时,应用程序崩溃了。

我使用的是Android 2.1 AVD,API 7,我添加了sdcard,audioOutput和audioInput。

我添加了以下内容:       在清单文件中。

我做的另一个观察是:我不知道音频文件存储的确切位置,但我不确定这是否存在任何问题。

提前谢谢!

我的代码是:

package com.example.helloandroid;

import java.io.IOException;

import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.widget.Button;
import android.widget.LinearLayout;
import android.view.View;
import android.view.ViewGroup;
import android.content.Context;
import android.util.Log;
/**
 * @author Natalia
 *
 */
public class HelloAndroidActivity extends Activity {
private static final String LOG_TAG = "AudioRecordTest";
private static String mFileName = null;
private RecordButton mRecordButton = null;
private MediaRecorder mRecorder = null; 
private PlayButton   mPlayButton = null; 
private MediaPlayer   mPlayer = null;

public static final int MODE_WORLD_WRITEABLE=0x00000002;


//path = "/sdcard/hola.3gp";
private void onRecord(boolean start) {
        if (start) {        
    startRecording();       
 } else { 
           stopRecording(); 
       }    
        } 
   private void onPlay(boolean start) {   
     if (start) {   
         startPlaying();  
      } else {   
         stopPlaying();     
   }    }    
private void startPlaying() { 
       mPlayer = new MediaPlayer(); 
       try {          
  mPlayer.setDataSource(mFileName); 
           mPlayer.prepare(); 
           mPlayer.start();
        } catch (IOException e) 
        { 
           Log.e(LOG_TAG, "prepare() failed");   
     }    
}   
 private void stopPlaying() {   
     mPlayer.release();      
  mPlayer = null;    }    
private void startRecording() {   
     mRecorder = new MediaRecorder();   
     mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 

        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
       mRecorder.setOutputFile(mFileName);
        try {            
mRecorder.prepare(); 
       } 
catch (IOException e) { 
           Log.e(LOG_TAG, "prepare() failed");   
     }      
 mRecorder.start();    
 } 
   private void stopRecording() { 
mRecorder.stop();        
mRecorder.release();        
mRecorder = null;   
 }
    class RecordButton extends Button { 
        boolean mStartRecording = true;
         OnClickListener clicker = new OnClickListener() { 
            public void onClick(View v) { 
                onRecord(mStartRecording); 
                if (mStartRecording) { 
                    setText("Stop recording");
                 } 
 else {            
         setText("Start recording");
                 }          
       mStartRecording = !mStartRecording;       
      }        };    
    public RecordButton(Context ctx) {  
           super(ctx);          
   setText("Start recording");  
           setOnClickListener(clicker);        }
       } 
       class PlayButton extends Button {    
     boolean mStartPlaying = true;        
 OnClickListener clicker = new OnClickListener() {          
       public void onClick(View v) {               
  onPlay(mStartPlaying);                
 if (mStartPlaying) {                  
   setText("Stop playing");                
 } else {                    
 setText("Start playing");   
              }            
     mStartPlaying = !mStartPlaying;  
           }        };     
    public PlayButton(Context ctx) {      
       super(ctx);            
 setText("Start playing");         
    setOnClickListener(clicker);        }
 }

       public void HelloAndroidActivity() {  
        mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();    
      mFileName += "/sdcard/hola.3gp";    }
       @Override            
   public void onCreate(Bundle icicle) {        
  super.onCreate(icicle);    
   LinearLayout ll = new LinearLayout(this);  
        mRecordButton = new RecordButton(this);       
   ll.addView(mRecordButton,     
         new LinearLayout.LayoutParams(             
     ViewGroup.LayoutParams.WRAP_CONTENT,          
        ViewGroup.LayoutParams.WRAP_CONTENT,          
        0));       
   mPlayButton = new PlayButton(this);     
     ll.addView(mPlayButton,      
        new LinearLayout.LayoutParams(  
                ViewGroup.LayoutParams.WRAP_CONTENT,  
                ViewGroup.LayoutParams.WRAP_CONTENT,         
         0));        
     //setContentView(ll);    
   } 
       @Override
     public void onPause() { 
         super.onPause();        
  if (mRecorder != null) {         
     mRecorder.release();  
            mRecorder = null;        }  
        if (mPlayer != null) {   
           mPlayer.release();
              mPlayer = null;       
   }    }



   }

我很抱歉因为这是一场小灾难!

这些是我的错误(我刚刚使用相同的代码创建了一个新的Activity):

  

12-27 12:04:55.456:E / AndroidRuntime(411):致命异常:主

     

12-27 12:04:55.456:E / AndroidRuntime(411):java.lang.IllegalStateException

     

12-27 12:04:55.456:E / AndroidRuntime(411):在android.media.MediaRecorder.start(原生方法)

     

12-27 12:04:55.456:E / AndroidRuntime(411):at Radar.packageRadar.app.Radar2Activity.startRecording(Radar2Activity.java:60)

     

12-27 12:04:55.456:E / AndroidRuntime(411):at Radar.packageRadar.app.Radar2Activity.onRecord(Radar2Activity.java:30)

     

12-27 12:04:55.456:E / AndroidRuntime(411):at Radar.packageRadar.app.Radar2Activity.access $ 0(Radar2Activity.java:28)

     

12-27 12:04:55.456:E / AndroidRuntime(411):at Radar.packageRadar.app.Radar2Activity $ RecordButton $ 1.onClick(Radar2Activity.java:71)

     

12-27 12:04:55.456:E / AndroidRuntime(411):在android.view.View.performClick(View.java:2408)

     

12-27 12:04:55.456:E / AndroidRuntime(411):在android.view.View $ PerformClick.run(View.java:8816)

     

12-27 12:04:55.456:E / AndroidRuntime(411):在android.os.Handler.handleCallback(Handler.java:587)

     

12-27 12:04:55.456:E / AndroidRuntime(411):在android.os.Handler.dispatchMessage(Handler.java:92)

     

12-27 12:04:55.456:E / AndroidRuntime(411):在android.os.Looper.loop(Looper.java:123)

     

12-27 12:04:55.456:E / AndroidRuntime(411):在android.app.ActivityThread.main(ActivityThread.java:4627)

     

12-27 12:04:55.456:E / AndroidRuntime(411):at java.lang.reflect.Method.invokeNative(Native Method)

     

12-27 12:04:55.456:E / AndroidRuntime(411):at java.lang.reflect.Method.invoke(Method.java:521)

     

12-27 12:04:55.456:E / AndroidRuntime(411):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:868)

     

12-27 12:04:55.456:E / AndroidRuntime(411):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)

     

12-27 12:04:55.456:E / AndroidRuntime(411):at dalvik.system.NativeStart.main(Native Method)

1 个答案:

答案 0 :(得分:1)

在与setContentView()合作之前,您必须致电Views。在super.onCreate()行之后立即拨打电话,您应该没事。