1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.example.android.mediarecorder; 18 19 import android.annotation.TargetApi; 20 import android.app.Activity; 21 import android.hardware.Camera; 22 import android.media.CamcorderProfile; 23 import android.media.MediaRecorder; 24 import android.os.AsyncTask; 25 import android.os.Build; 26 import android.os.Bundle; 27 import android.util.Log; 28 import android.view.Menu; 29 import android.view.TextureView; 30 import android.view.View; 31 import android.widget.Button; 32 33 import com.example.android.common.media.CameraHelper; 34 35 import java.io.IOException; 36 import java.util.List; 37 38 /** 39 * This activity uses the camera/camcorder as the A/V source for the {@link android.media.MediaRecorder} API. 40 * A {@link android.view.TextureView} is used as the camera preview which limits the code to API 14+. This 41 * can be easily replaced with a {@link android.view.SurfaceView} to run on older devices. 42 */ 43 public class MainActivity extends Activity { 44 45 private Camera mCamera; 46 private TextureView mPreview; 47 private MediaRecorder mMediaRecorder; 48 49 private boolean isRecording = false; 50 private static final String TAG = "Recorder"; 51 private Button captureButton; 52 53 @Override 54 protected void onCreate(Bundle savedInstanceState) { 55 super.onCreate(savedInstanceState); 56 setContentView(R.layout.sample_main); 57 58 mPreview = (TextureView) findViewById(R.id.surface_view); 59 captureButton = (Button) findViewById(R.id.button_capture); 60 } 61 62 /** 63 * The capture button controls all user interaction. When recording, the button click 64 * stops recording, releases {@link android.media.MediaRecorder} and {@link android.hardware.Camera}. When not recording, 65 * it prepares the {@link android.media.MediaRecorder} and starts recording. 66 * 67 * @param view the view generating the event. 68 */ 69 public void onCaptureClick(View view) { 70 if (isRecording) { 71 // BEGIN_INCLUDE(stop_release_media_recorder) 72 73 // stop recording and release camera 74 mMediaRecorder.stop(); // stop the recording 75 releaseMediaRecorder(); // release the MediaRecorder object 76 mCamera.lock(); // take camera access back from MediaRecorder 77 78 // inform the user that recording has stopped 79 setCaptureButtonText("Capture"); 80 isRecording = false; 81 releaseCamera(); 82 // END_INCLUDE(stop_release_media_recorder) 83 84 } else { 85 86 // BEGIN_INCLUDE(prepare_start_media_recorder) 87 88 new MediaPrepareTask().execute(null, null, null); 89 90 // END_INCLUDE(prepare_start_media_recorder) 91 92 } 93 } 94 95 private void setCaptureButtonText(String title) { 96 captureButton.setText(title); 97 } 98 99 @Override 100 protected void onPause() { 101 super.onPause(); 102 // if we are using MediaRecorder, release it first 103 releaseMediaRecorder(); 104 // release the camera immediately on pause event 105 releaseCamera(); 106 } 107 108 private void releaseMediaRecorder(){ 109 if (mMediaRecorder != null) { 110 // clear recorder configuration 111 mMediaRecorder.reset(); 112 // release the recorder object 113 mMediaRecorder.release(); 114 mMediaRecorder = null; 115 // Lock camera for later use i.e taking it back from MediaRecorder. 116 // MediaRecorder doesn't need it anymore and we will release it if the activity pauses. 117 mCamera.lock(); 118 } 119 } 120 121 private void releaseCamera(){ 122 if (mCamera != null){ 123 // release the camera for other applications 124 mCamera.release(); 125 mCamera = null; 126 } 127 } 128 129 @TargetApi(Build.VERSION_CODES.HONEYCOMB) 130 private boolean prepareVideoRecorder(){ 131 132 // BEGIN_INCLUDE (configure_preview) 133 mCamera = CameraHelper.getDefaultCameraInstance(); 134 135 // We need to make sure that our preview and recording video size are supported by the 136 // camera. Query camera to find all the sizes and choose the optimal size given the 137 // dimensions of our preview surface. 138 Camera.Parameters parameters = mCamera.getParameters(); 139 List<Camera.Size> mSupportedPreviewSizes = parameters.getSupportedPreviewSizes(); 140 Camera.Size optimalSize = CameraHelper.getOptimalPreviewSize(mSupportedPreviewSizes, 141 mPreview.getWidth(), mPreview.getHeight()); 142 143 // Use the same size for recording profile. 144 CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH); 145 profile.videoFrameWidth = optimalSize.width; 146 profile.videoFrameHeight = optimalSize.height; 147 148 // likewise for the camera object itself. 149 parameters.setPreviewSize(profile.videoFrameWidth, profile.videoFrameHeight); 150 mCamera.setParameters(parameters); 151 try { 152 // Requires API level 11+, For backward compatibility use {@link setPreviewDisplay} 153 // with {@link SurfaceView} 154 mCamera.setPreviewTexture(mPreview.getSurfaceTexture()); 155 } catch (IOException e) { 156 Log.e(TAG, "Surface texture is unavailable or unsuitable" + e.getMessage()); 157 return false; 158 } 159 // END_INCLUDE (configure_preview) 160 161 162 // BEGIN_INCLUDE (configure_media_recorder) 163 mMediaRecorder = new MediaRecorder(); 164 165 // Step 1: Unlock and set camera to MediaRecorder 166 mCamera.unlock(); 167 mMediaRecorder.setCamera(mCamera); 168 169 // Step 2: Set sources 170 mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT ); 171 mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); 172 173 // Step 3: Set a CamcorderProfile (requires API Level 8 or higher) 174 mMediaRecorder.setProfile(profile); 175 176 // Step 4: Set output file 177 mMediaRecorder.setOutputFile(CameraHelper.getOutputMediaFile( 178 CameraHelper.MEDIA_TYPE_VIDEO).toString()); 179 // END_INCLUDE (configure_media_recorder) 180 181 // Step 5: Prepare configured MediaRecorder 182 try { 183 mMediaRecorder.prepare(); 184 } catch (IllegalStateException e) { 185 Log.d(TAG, "IllegalStateException preparing MediaRecorder: " + e.getMessage()); 186 releaseMediaRecorder(); 187 return false; 188 } catch (IOException e) { 189 Log.d(TAG, "IOException preparing MediaRecorder: " + e.getMessage()); 190 releaseMediaRecorder(); 191 return false; 192 } 193 return true; 194 } 195 196 /** 197 * Asynchronous task for preparing the {@link android.media.MediaRecorder} since it's a long blocking 198 * operation. 199 */ 200 class MediaPrepareTask extends AsyncTask<Void, Void, Boolean> { 201 202 @Override 203 protected Boolean doInBackground(Void... voids) { 204 // initialize video camera 205 if (prepareVideoRecorder()) { 206 // Camera is available and unlocked, MediaRecorder is prepared, 207 // now you can start recording 208 mMediaRecorder.start(); 209 210 isRecording = true; 211 } else { 212 // prepare didn't work, release the camera 213 releaseMediaRecorder(); 214 return false; 215 } 216 return true; 217 } 218 219 @Override 220 protected void onPostExecute(Boolean result) { 221 if (!result) { 222 MainActivity.this.finish(); 223 } 224 // inform the user that recording has started 225 setCaptureButtonText("Stop"); 226 227 } 228 } 229 230 }
