在 if 语句中通过 OnClick 事件录制音频

【问题标题】：Recording audio by an OnClick event in an if statement在 if 语句中通过 OnClick 事件录制音频
【发布时间】：2016-05-11 11:09:43
【问题描述】：

我想创建一个既可以开始录制音频又可以停止录制音频的按钮。我试图让按钮将其文本从“开始录制”更改为“停止录制”。但是，我无法做到这一点。

这些是我遇到的以下问题：

1) 无法获取 xml onClick 事件以匹配相关类。但是，当我在课堂上突出显示 RecordButton 代码并查找与活动中的 onClick 事件匹配的用法时。

2) 我的应用上的按钮上没有显示文字

3) 当我点击按钮时，我的应用崩溃了

我对编码也很陌生。

我的班级如下：

package kyr.com.knowyourrights;


import android.content.Intent;
import android.media.MediaRecorder;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.TextView;



import java.io.IOException;



public class Drugs extends AppCompatActivity {


WebView myBrowser;
MediaRecorder mRecorder;
private static String audioFilePath;
public boolean isRecording = false;


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



    myBrowser = (WebView) findViewById(R.id.mybrowser);
    myBrowser.loadUrl("file:///android_asset/drugs.html");
    myBrowser.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);

    Button btndrugslaw = (Button) findViewById(R.id.drugslaw);
    Button btnrecord = (Button) findViewById(R.id.RecordButton);



    btndrugslaw.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            Intent intentdruglaw = new Intent(Drugs.this, DrugLaw.class);
            startActivity(intentdruglaw);
        }
    });}


    public void RecordButton (View view) throws IOException {
        TextView textView = (TextView) findViewById(R.id.RecordButton);
        audioFilePath =
                Environment.getExternalStorageDirectory().getAbsolutePath()
                        + "/myaudio.3gp";

        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mRecorder.setOutputFile(audioFilePath);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        mRecorder.start();

        if (isRecording) {
            stopRecording();
            isRecording = false;
            textView.setText("start");
        } else {
            startRecording();
            isRecording = true;
            textView.setText("stop");
        }};

public void startRecording() {
    mRecorder.start();
}


public void stopRecording() {
    mRecorder.stop();
    mRecorder.release();
    mRecorder = null;
}}

我的活动如下：

<ScrollView
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent">

<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"
tools:context="kyr.com.knowyourrights.Drugs"
android:orientation="vertical"
>




<WebView
    android:id="@+id/mybrowser"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:layout_alignParentLeft="false"
    android:layout_alignParentStart="true"
    android:layout_below="@+id/RecordButton"
    >

</WebView>

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/RecordButton"
    android:onClick="RecordButton"
    android:layout_centerHorizontal="true"
    android:layout_alignParentTop="true"
    />


<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/drugslaw"
    android:text="Take me to the law"
    android:layout_below="@+id/mybrowser"
    android:layout_centerHorizontal="true"
    android:layout_alignParentBottom="true" />

</RelativeLayout>


</ScrollView>

我的日志猫报告：

05-11 23:18:31.893  29728-29728/? I/art﹕ Late-enabling -Xcheck:jni
05-11 23:18:32.051  29728-29746/kyr.com.knowyourrights D/OpenGLRenderer﹕ Use EGL_SWAP_BEHAVIOR_PRESERVED: true
05-11 23:18:32.059  29728-29728/kyr.com.knowyourrights D/Atlas﹕ Validating map...
05-11 23:18:32.116  29728-29746/kyr.com.knowyourrights I/Adreno-EGL﹕ <qeglDrvAPI_eglInitialize:410>: EGL 1.4 QUALCOMM build: Nondeterministic_AU_msm8974_LA.BF.1.1.1.C3__release_AU ()
    OpenGL ES Shader Compiler Version: E031.25.03.06
    Build Date: 04/27/15 Mon
    Local Branch: mybranch9445032
    Remote Branch: quic/LA.BF.1.1.1.c3_1
    Local Patches: NONE
    Reconstruct Branch: NOTHING
05-11 23:18:32.118  29728-29746/kyr.com.knowyourrights I/OpenGLRenderer﹕ Initialized EGL, version 1.4
05-11 23:18:32.143  29728-29746/kyr.com.knowyourrights D/OpenGLRenderer﹕ Enabling debug mode 0
05-11 23:18:32.237  29728-29728/kyr.com.knowyourrights I/Timeline﹕ Timeline: Activity_idle id: android.os.BinderProxy@1a037f4a time:44708449
05-11 23:18:40.297  29728-29728/kyr.com.knowyourrights I/Timeline﹕ Timeline: Activity_launch_request id:kyr.com.knowyourrights time:44716509
05-11 23:18:40.373  29728-29728/kyr.com.knowyourrights I/WebViewFactory﹕ Loading com.google.android.webview version 50.0.2661.86 (code 266108600)
05-11 23:18:40.392  29728-29728/kyr.com.knowyourrights I/cr_LibraryLoader﹕ Time to load native libraries: 1 ms (timestamps 6603-6604)
05-11 23:18:40.392  29728-29728/kyr.com.knowyourrights I/cr_LibraryLoader﹕ Expected native library version number "50.0.2661.86", actual native library version number "50.0.2661.86"
05-11 23:18:40.401  29728-29728/kyr.com.knowyourrights V/WebViewChromiumFactoryProvider﹕ Binding Chromium to main looper Looper (main, tid 1) {2db660c6}
05-11 23:18:40.401  29728-29728/kyr.com.knowyourrights I/cr_LibraryLoader﹕ Expected native library version number "50.0.2661.86", actual native library version number "50.0.2661.86"
05-11 23:18:40.401  29728-29728/kyr.com.knowyourrights I/chromium﹕ [INFO:library_loader_hooks.cc(143)] Chromium logging enabled: level = 0, default verbosity = 0
05-11 23:18:40.414  29728-29728/kyr.com.knowyourrights I/cr_BrowserStartup﹕ Initializing chromium process, singleProcess=true
05-11 23:18:40.420  29728-29728/kyr.com.knowyourrights E/ApkAssets﹕ Error while loading asset assets/natives_blob_64.bin: java.io.FileNotFoundException: assets/natives_blob_64.bin
05-11 23:18:40.420  29728-29728/kyr.com.knowyourrights E/ApkAssets﹕ Error while loading asset assets/snapshot_blob_64.bin: java.io.FileNotFoundException: assets/snapshot_blob_64.bin
05-11 23:18:40.466  29728-29833/kyr.com.knowyourrights W/cr_media﹕ Requires BLUETOOTH permission
05-11 23:18:40.471  29728-29728/kyr.com.knowyourrights I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.WebViewContentsClientAdapter$WebResourceErrorImpl>
05-11 23:18:40.472  29728-29728/kyr.com.knowyourrights I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.WebViewContentsClientAdapter$WebResourceErrorImpl>
05-11 23:18:40.507  29728-29728/kyr.com.knowyourrights I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<org.chromium.content.browser.FloatingWebActionModeCallback>
05-11 23:18:40.507  29728-29728/kyr.com.knowyourrights I/art﹕ Rejecting re-init on previously-failed class java.lang.Class<org.chromium.content.browser.FloatingWebActionModeCallback>
05-11 23:18:40.523  29728-29728/kyr.com.knowyourrights D/cr_Ime﹕ [InputMethodManagerWrapper.java:30] Constructor
05-11 23:18:40.530  29728-29728/kyr.com.knowyourrights W/cr_AwContents﹕ onDetachedFromWindow called when already detached. Ignoring
05-11 23:18:40.531  29728-29728/kyr.com.knowyourrights D/cr_Ime﹕ [InputMethodManagerWrapper.java:59] isActive: false
05-11 23:18:40.543  29728-29728/kyr.com.knowyourrights I/cr_Ime﹕ ImeThread is not enabled.
05-11 23:18:40.576  29728-29843/kyr.com.knowyourrights E/libEGL﹕ validate_display:255 error 3008 (EGL_BAD_DISPLAY)
05-11 23:18:40.622  29728-29746/kyr.com.knowyourrights D/OpenGLRenderer﹕ endAllStagingAnimators on 0xb499db80 (RippleDrawable) with handle 0xae82c9c0
05-11 23:18:40.636  29728-29728/kyr.com.knowyourrights W/cr_BindingManager﹕ Cannot call determinedVisibility() - never saw a connection for the pid: 29728
05-11 23:18:40.637  29728-29728/kyr.com.knowyourrights D/cr_Ime﹕ [InputMethodManagerWrapper.java:59] isActive: true
05-11 23:18:40.637  29728-29728/kyr.com.knowyourrights D/cr_Ime﹕ [InputMethodManagerWrapper.java:68] hideSoftInputFromWindow
05-11 23:18:40.640  29728-29728/kyr.com.knowyourrights I/Timeline﹕ Timeline: Activity_idle id: android.os.BinderProxy@3ba92c8b time:44716852
05-11 23:18:44.165  29728-29728/kyr.com.knowyourrights E/MediaRecorder﹕ start called in an invalid state: 4
05-11 23:18:44.166  29728-29728/kyr.com.knowyourrights D/AndroidRuntime﹕ Shutting down VM
05-11 23:18:44.167  29728-29728/kyr.com.knowyourrights E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: kyr.com.knowyourrights, PID: 29728
    java.lang.IllegalStateException: Could not execute method of the activity
            at android.view.View$1.onClick(View.java:4029)
            at android.view.View.performClick(View.java:4789)
            at android.view.View$PerformClick.run(View.java:19881)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5294)
            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:904)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
     Caused by: java.lang.reflect.InvocationTargetException
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4024)
            at android.view.View.performClick(View.java:4789)
            at android.view.View$PerformClick.run(View.java:19881)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5294)
            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:904)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
     Caused by: java.lang.IllegalStateException
            at android.media.MediaRecorder.start(Native Method)
            at kyr.com.knowyourrights.Drugs.RecordButton(Drugs.java:64)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4024)
            at android.view.View.performClick(View.java:4789)
            at android.view.View$PerformClick.run(View.java:19881)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5294)
            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:904)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)

【问题讨论】：

  • 请发布您的 logcat 代码
  • 发布@beardedbeast

标签： java android xml user-interface


【解决方案1】：

每次单击R.id.RecordButton 按钮时，您都会创建一个新的MediaRecorder，这意味着在您开始录制后，当您按下停止时，您会尝试停止从未启动的MediaRecorder（新创建的）。

另外，您必须在start() 之前调用prepare()，并且R.id.RecordButton 是Button 而不是TextView。

试试这个：

public void RecordButton (View view) {
    if(mRecorder == null){
        audioFilePath = Environment.getExternalStorageDirectory().getAbsolutePath()
                    + "/myaudio.3gp";
        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mRecorder.setOutputFile(audioFilePath);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);    
    }
    if (isRecording) {
        try{
            stopRecording();
            isRecording = false;
            ((Button)view).setText("start");
        }catch(Exception e){
           e.printStackTrace();
        }
    } else {
        try{
            startRecording();
            isRecording = true;
            ((Button)view).setText("stop");
        }catch(Exception e){
           e.printStackTrace();
        }
    }
}

public void startRecording() throws IllegalStateException, IOException{
    mRecorder.prepare();
    mRecorder.start();
}
public void stopRecording() throws IllegalStateException, IOException{
    mRecorder.stop();
    mRecorder.release();
}

【讨论】：

  • 嘿，当我运行此代码时出现此错误：错误：（75、26）错误：未报告的异常IOException；必须被抓住或宣布被抛出@Titus
  • 部分有效！我仍然遇到的问题是，当我进入应用程序中的相关屏幕时，按钮开始时没有文本。一旦我单击按钮，它就会显示“停止”，当我单击“停止”时，它会显示“开始”。如果我再次单击“开始”，应用程序就会崩溃。 @Titus
  • @Viverson 您可以将 xml 文件中的android:text="Start" 属性添加到@+id/RecordButton 按钮，这样它就不会为空。如果您想开始录制不止一次，在您的stopRecording() 方法中，您需要调用reset() 而不是release()。请记住，您需要在完成后释放MediaRecorder（您不会再次调用start()）。
  • 有一点困难，所以我用 release() 替换了 reset()，我知道我需要创建一个新的 MediaRecorder 实例，所以我认为我必须放置 MediaRecorder mrecorder =新的 MediaRecorder 某处？并且还必须将函数 release() 放在某个地方
  • @Viverson 如果要复用MediaRecorder实例，只需将stopRecording()中的mRecorder.release();替换为mRecorder.reset();即可，如果不想复用，添加mRecorder = null;在stopRecording() 方法结束时，下次按下按钮时，将创建一个新实例。
【解决方案2】：

//更新了..

让我们解决这个问题！所以首先你需要从 Layout 文件中删除 android:onClick="RecordButton" 并将 Text 设置为：

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/RecordButton"
    android:text="Start Recording"
    android:layout_centerHorizontal="true"
    android:layout_alignParentTop="true"
    />

然后在你的 onCreate() 中做这样的改变。

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

     Button btndrugslaw = (Button) findViewById(R.id.drugslaw);
     Button btnrecord = (Button) findViewById(R.id.RecordButton);

    btnrecord.setOnClickListener(new EventHandler());
    btndrugslaw.setOnClickListener(new EventHandler());
    }



    private class EventHandler implements OnClickListener
        {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                switch(v.getId())
                {
                    case R.id.RecordButton:
                     if(btnrecord.getText().equalsIgnoreCase("Start Recording"))
                     {
            btnrecord.setText("Stop Recording");
    audioFilePath =
                Environment.getExternalStorageDirectory().getAbsolutePath()
                        + "/myaudio.3gp";

        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mRecorder.setOutputFile(audioFilePath);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        mRecorder.start();

                      }
              else{
               btnrecord.setText("Start Recording");
                 //code to stop the player
}                  
                    break;

                    case R.id.drugslaw:
                    Your action here...
                    break;
    }
}

【讨论】：

  • 我收到一个错误，它突出显示 btnrecord 说明它尚未定义。我如何定义它？ @AkshatVajpayee
  • 全局定义按钮为Button btnrecord,btndrugslaw；在 onCreate(); 之前
  • 感谢@AkshatVajpayee 的帮助，但 Titus 能够让我更接近我的答案！
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