我想创建一个按钮，它既开始录制音频又停止录制音频。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。
以下是我遇到的问题：
1）无法获取xml onClick事件以匹配相关的Class。但是，当我在我的类中突出显示RecordButton代码并找到它时，它与活动中的onClick事件匹配。
2）我的应用程序按钮上没有显示文字
3）当我点击按钮时，我的应用程序崩溃
此外，我对编码非常陌生。
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)
答案 0 :(得分：0)
每次点击SELECT temp.* FROM (SELECT a AS x, a AS y
FROM table) as temp WHERE temp.x = '1' AND temp.y = '2'
按钮时，您都会创建新的MediaRecorder，这意味着在您开始录制后，当您按停止时，您将尝试停止{从未启动的{1}}（新创建的）。
此外，您必须在R.id.RecordButton之前致电MediaRecorder，而prepare()是start()而不是R.id.RecordButton。
试试这个：
Button答案 1 :(得分：0)
//Updated..
Let's fix this! So first you need to remove the android:onClick="RecordButton" from the Layout file and set Text as:
<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"
/>
Then in your onCreate() do the changes like this.
@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;
}
}