Android多媒体功能开发-使用MediaRecorder类录制视频的例子

package com.zzk.a1509videorecord; import android.Manifest; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.content.pm.PackageManager; import android.hardware.Camera; import android.hardware.Camera.Parameters; import android.hardware.Camera.Size; import android.media.MediaRecorder; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.util.Log; import android.view.SurfaceView; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.LinearLayout; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import androidx.core.content.FileProvider; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { String[] permissions = {Manifest.permission.CAMERA, Manifest.permission.RECORD_AUDIO}; File videoFile; Uri videoUri; Camera mCamera; MediaRecorder mRecorder; SurfaceView mPreview; int cameraID = 0; List<Size> sizes; int curSize; String[] sizeItems; List<int[]> fpsRanges; int curFpsRange; String[] fpsRangeItems; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LinearLayout ll = new LinearLayout(this); ll.setOrientation(LinearLayout.VERTICAL); setContentView(ll); LinearLayout line1 = new LinearLayout(this); line1.setOrientation(LinearLayout.HORIZONTAL); ll.addView(line1); LinearLayout line2 = new LinearLayout(this); line2.setOrientation(LinearLayout.HORIZONTAL); ll.addView(line2); LinearLayout line3 = new LinearLayout(this); line3.setOrientation(LinearLayout.HORIZONTAL); ll.addView(line3); videoFile = new File(getExternalFilesDir(null), "video.3gp"); // 定义多媒体文件的uri，在应用之间传递文件时需要用uri if(Build.VERSION.SDK_INT>=24){ // Android 7 以后不能直接用file uri分享文件，要使用FileProvider String fileProviderAuthority = getPackageName() + ".fileProvider"; // FileProvider的名字，FileProvider在应用配置文件AndroidManifest中定义 // 格式为：content://com.zzk.a1509videorecord.fileProvider/testdir/video.3gp, testdir是res/file_paths/file_paths.xml中定义的目录别名 videoUri = FileProvider.getUriForFile(MainActivity.this, fileProviderAuthority, videoFile); } else { // Android 7 以前可以直接用file uri分享文件 // 格式为：file:///storage/emulated/0/Android/data/com.zzk.a1509videorecord/files/video.3gp videoUri = Uri.fromFile(videoFile); } mRecorder = new MediaRecorder(); Button btnRecord = new Button(this); btnRecord.setText("Record"); line1.addView(btnRecord); btnRecord.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { // 下列设置的顺序不能随便调整 if(!checkPermissions(permissions, 100)) { return; } startRecord(); } }); Button btnStop = new Button(this); btnStop.setText("Stop"); line1.addView(btnStop); btnStop.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { mRecorder.stop(); if(mCamera!=null) mCamera.lock(); } }); Button btnView = new Button(this); btnView.setText("View"); line1.addView(btnView); btnView.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { if(videoFile.exists()){ Intent intent = new Intent(Intent.ACTION_VIEW); intent.setDataAndType(videoUri, "video/*"); intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); // 授予对方读取该文件的权限 startActivity(intent); } } }); Button btnOpen = new Button(this); btnOpen.setText("Open"); line2.addView(btnOpen); btnOpen.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { if(!checkPermissions(permissions, 101)) { return; } open(cameraID); } }); Button btnStartPreview = new Button(this); btnStartPreview.setText("StartPre"); line2.addView(btnStartPreview); btnStartPreview.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { if(mCamera!=null) { mCamera.startPreview(); } } }); Button btnStopPreview = new Button(this); btnStopPreview.setText("StopPre"); line2.addView(btnStopPreview); btnStopPreview.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { if(mCamera!=null) { mCamera.stopPreview(); } } }); Button btnRelease = new Button(this); btnRelease.setText("Release"); line2.addView(btnRelease); btnRelease.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { if(mCamera!=null) { mCamera.release(); mCamera=null; } } }); Button btnSwitch = new Button(this); btnSwitch.setText("Switch Camera"); line3.addView(btnSwitch); btnSwitch.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { cameraID++; if(cameraID>=Camera.getNumberOfCameras()) cameraID = 0; mCamera.stopPreview(); mCamera.release(); open(cameraID); mCamera.startPreview(); } }); Button btnSize = new Button(this); btnSize.setText("Size"); line3.addView(btnSize); btnSize.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setSingleChoiceItems(sizeItems, curSize, new DialogInterface.OnClickListener(){ @Override public void onClick(DialogInterface arg0, int arg1) { curSize = arg1; arg0.dismiss(); } }); builder.show(); } }); Button btnFps = new Button(this); btnFps.setText("FrameRate"); line3.addView(btnFps); btnFps.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setSingleChoiceItems(fpsRangeItems, curFpsRange, new DialogInterface.OnClickListener(){ @Override public void onClick(DialogInterface arg0, int arg1) { curFpsRange = arg1; arg0.dismiss(); } }); builder.show(); } }); mPreview = new SurfaceView(this); ll.addView(mPreview); } @Override pro