我按照这个网站回复做 （Custom Video Recording Screen） 但不知道为什么得到RuntimeException ...
这是错误日志：
07-11 16:31:33.246: D/ActivityThread(10990): handleBindApplication:com.example.capturevideo
07-11 16:31:33.246: D/ActivityThread(10990): setTargetHeapUtilization:0.75
07-11 16:31:33.246: D/ActivityThread(10990): setTargetHeapMinFree:2097152
07-11 16:31:33.416: D/AndroidRuntime(10990): Shutting down VM
07-11 16:31:33.416: W/dalvikvm(10990): threadid=1: thread exiting with uncaught exception (group=0x4188cce0)
07-11 16:31:33.426: E/AndroidRuntime(10990): FATAL EXCEPTION: main
07-11 16:31:33.426: E/AndroidRuntime(10990): Process: com.example.capturevideo, PID: 10990
07-11 16:31:33.426: E/AndroidRuntime(10990): java.lang.RuntimeException: Unable to instantiate activity
ComponentInfo{com.example.capturevideo/com.example.capturevideo.CaptureVideo}: java.lang.ClassCastException: com.example.capturevideo.CaptureVideo cannot be cast to android.app.Activity
07-11 16:31:33.426: E/AndroidRuntime(10990): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
07-11 16:31:33.426: E/AndroidRuntime(10990): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2277)
07-11 16:31:33.426: E/AndroidRuntime(10990): at android.app.ActivityThread.access$800(ActivityThread.java:144)
07-11 16:31:33.426: E/AndroidRuntime(10990): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1205)
07-11 16:31:33.426: E/AndroidRuntime(10990): at android.os.Handler.dispatchMessage(Handler.java:102)
07-11 16:31:33.426: E/AndroidRuntime(10990): at android.os.Looper.loop(Looper.java:136)
07-11 16:31:33.426: E/AndroidRuntime(10990): at android.app.ActivityThread.main(ActivityThread.java:5147)
07-11 16:31:33.426: E/AndroidRuntime(10990): at java.lang.reflect.Method.invokeNative(Native Method)
07-11 16:31:33.426: E/AndroidRuntime(10990): at java.lang.reflect.Method.invoke(Method.java:515)
07-11 16:31:33.426: E/AndroidRuntime(10990): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
07-11 16:31:33.426: E/AndroidRuntime(10990): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:611)
07-11 16:31:33.426: E/AndroidRuntime(10990): at dalvik.system.NativeStart.main(Native Method)
07-11 16:31:33.426: E/AndroidRuntime(10990): Caused by: java.lang.ClassCastException: com.example.capturevideo.CaptureVideo cannot be cast to android.app.Activity
07-11 16:31:33.426: E/AndroidRuntime(10990): at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
07-11 16:31:33.426: E/AndroidRuntime(10990): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2135)
07-11 16:31:33.426: E/AndroidRuntime(10990): ... 11 more
CaptureVideo.java
package com.example.capturevideo;
import java.io.IOException;
import java.util.Random;
import android.app.Activity;
import android.app.Fragment;
import android.annotation.SuppressLint;
import android.content.res.Configuration;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
public class CaptureVideo extends Fragment implements OnClickListener, SurfaceHolder.Callback{
private Button btnStartRec;
MediaRecorder recorder;
SurfaceHolder holder;
boolean recording = false;
private int randomNum;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view001 = inflater.inflate(R.layout.capture_video,container,false);
recorder = new MediaRecorder();
initRecorder();
btnStartRec = (Button) view001.findViewById(R.id.btnCaptureVideo);
btnStartRec.setOnClickListener(this);
SurfaceView cameraView = (SurfaceView)view001.findViewById(R.id.surfaceCamera);
holder = cameraView.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
cameraView.setClickable(true);
cameraView.setOnClickListener(this);
return view001;
}
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
}
@SuppressLint({ "SdCardPath", "NewApi" })
private void initRecorder() {
Random rn = new Random();
int maximum = 10000000;
int minimum = 00000001;
int range = maximum - minimum + 1;
randomNum = rn.nextInt(range) + minimum + 1 - 10;
recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP);
if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
recorder.setOrientationHint(90);//plays the video correctly
}else{
recorder.setOrientationHint(180);
}
recorder.setOutputFile("/sdcard/MediaAppVideos/"+randomNum+".mp4");
}
private void prepareRecorder() {
recorder.setPreviewDisplay(holder.getSurface());
try {
recorder.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
//finish();
} catch (IOException e) {
e.printStackTrace();
//finish();
}
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnCaptureVideo:
try{
if (recording) {
recorder.stop();
recording = false;
// Let's initRecorder so we can record again
//initRecorder();
//prepareRecorder();
} else {
recording = true;
recorder.start();
}
}catch(Exception e){
}
default:
break;
}
}
public void surfaceCreated(SurfaceHolder holder) {
prepareRecorder();
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
public void surfaceDestroyed(SurfaceHolder holder) {
try {
if (recording) {
recorder.stop();
recording = false;
}
recorder.release();
// finish();
} catch (Exception e) {
}
}
}
capture_video.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<SurfaceView
android:id="@+id/surfaceCamera"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnCaptureVideo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Start Recording" />
</RelativeLayout>
的AndroidManifest.xml：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.capturevideo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="17"
android:targetSdkVersion="20" />
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.capturevideo.CaptureVideo"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
答案 0 :(得分：1)
您已在活动代码
中的Manifest文件中声明了Fragment android:name="com.example.capturevideo.CaptureVideo" // must be removed from manifest
仅在清单文件中声明活动。片段通常附加到活动视图组，例如FrameLayout，它充当容器。
在清单中声明活动。将CaptureVideo片段附加到活动。
答案 1 :(得分：0)
正如其他人所说：如果你不需要使用Fragment，那么只需坚持使用Activity。如果可以，请删除Fragment的所有引用和用法，并替换为Activity。