android倒计时录制视频下载,android录制视屏（预览，倒计时）
android用mediarecord錄制視屏，可以設置視屏格式，大小，還有拍攝前預覽，倒計時功能要自己用hander做。
1,CameraPreview.java
//預覽class
public class CameraPreview extends SurfaceView implements Callback {
private static final String TAG = "TAG-CameraPreview";
private SurfaceHolder mHolder;
private Camera mCamera;
public CameraPreview(Context context, Camera camera) {
super(context);
mCamera = camera;
// 安裝一個SurfaceHolder.Callback
mHolder = getHolder();
mHolder.addCallback(this);
// 針對低于3.0的Android
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// 把預覽畫面的位置通知攝像頭
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
Log.d(TAG, "Error setting camera preview: " + e.getMessage());
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
if (mHolder.getSurface() == null){
// 預覽surface不存在
return;
}
// 更改時停止預覽
try {
mCamera.stopPreview();
} catch (Exception e){
}
// 在此進行縮放、旋轉和重新組織格式
// 以新的設置啟動預覽
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e){
Log.d(TAG, "Error starting camera preview: " + e.getMessage());
}
}
}
2,RecordMp4.java
public class RecordMp4 extends Activity implements SurfaceHolder.Callback {
private Button mStopButton;
// private SurfaceView mSurfaceView;
private SurfaceHolder mSurfaceHolder;
private MediaRecorder mMediaRecorder;
private String path, pid, uid;
private CheckBox playOrStop;
private Camera mCamera;
private CameraPreview mSurfaceView;
private TextView recor_mp4_left_time;
private int second = 20;
Handler handler;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 去掉標題欄
requestWindowFeature(Window.FEATURE_NO_TITLE);
// 設置全屏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
// 設置橫屏顯示
setContentView(R.layout.record_mp4);
handler = new Handler();
pid = getIntent().getStringExtra("pid");
uid = getIntent().getStringExtra("uid");
init();
}
private void init() {
playOrStop = (CheckBox) findViewById(R.id.etsound_playstop);
playOrStop.setOnClickListener(new ClickListenerImpl());
recor_mp4_left_time = (TextView) findViewById(R.id.recor_mp4_left_time);
mCamera = getCameraInstance();
// 創建Preview view并將其設為activity中的內容
mSurfaceView = new CameraPreview(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(mSurfaceView);
mSurfaceHolder = mSurfaceView.getHolder();
mSurfaceHolder.addCallback(this);
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
Runnable runnable = new Runnable() {
@Override
public void run() {
second--;
if (second <= 0) {
handler.removeCallbacks(this);
} else {
recor_mp4_left_time.setText("還剩" + second + "s");
handler.postDelayed(this, 1000);
}
}
};
private Camera getCameraInstance() {
Camera c = null;
try {
// 獲取Camera實例
c = Camera.open();
c.setDisplayOrientation(90);
} catch (Exception e) {
// 攝像頭不可用(正被占用或不存在)
}
// 不可用則返回null
return c;
}
@SuppressLint("NewApi")
private void initMediaRecorder() {
// next codes is right for 2.3 and 4.0
mMediaRecorder = new MediaRecorder();
// mCamera = Camera.open();
// mCamera.setDisplayOrientation(90);
mCamera.unlock();
mMediaRecorder.setCamera(mCamera);
// 設置視頻源
mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mMediaRecorder.setOrientationHint(90);// 視頻旋轉90度
// 設置音頻源
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
// 設置文件輸出格式
mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
// 設置視頻編碼方式
mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
// 設置音頻編碼方式
mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
// 設置視頻高和寬,注意文檔的說明:
// Must be called after setVideoSource().
// Call this after setOutFormat() but before prepare().
// 設置錄制的視頻幀率,注意文檔的說明:
// Must be called after setVideoSource().
// Call this after setOutFormat() but before prepare().
mMediaRecorder.setVideoFrameRate(16);
// 設置預覽畫面
mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());
// 設置輸出路徑
path =this.getFilesDir().getAbsolutePath()+File.separator+System.currentTimeMillis()+".mp4";
mMediaRecorder.setOutputFile(path);
mMediaRecorder.setVideoSize(640, 480);
// 設置視頻的最大持續時間
mMediaRecorder.setMaxDuration(20000);
// 為MediaRecorder設置監聽
mMediaRecorder.setOnInfoListener(new OnInfoListener() {
public void onInfo(MediaRecorder mr, int what, int extra) {
if (what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED) {
TCommUtil.showToast(RecordMp4.this, "已經達到最長錄制時間", true);
System.out.println("已經達到最長錄制時間");
if (mMediaRecorder != null) {
mMediaRecorder.stop();
mMediaRecorder.release();
mMediaRecorder = null;
}
}
}
});
}
private class ClickListenerImpl implements OnClickListener {
public void onClick(View v) {
CheckBox checkBox = (CheckBox) v;
if (checkBox.getId() == R.id.etsound_playstop) {
if (mMediaRecorder == null) {
try {
initMediaRecorder();
mMediaRecorder.prepare();
mMediaRecorder.start();
handler.postDelayed(runnable, 0);
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} else {
if (mMediaRecorder != null) {
mMediaRecorder.stop();
releaseMediaRecorder();
mCamera.lock();
}
}
}
}
}
@Override
protected void onPause() {
super.onPause();
handler.removeCallbacks(runnable);
// 如果正在使用MediaRecorder，首先需要釋放它。
releaseMediaRecorder();
// 在暫停事件中立即釋放攝像頭
releaseCamera();
}
private void releaseMediaRecorder() {
if (mMediaRecorder != null) {
// 清除recorder配置
handler.removeCallbacks(runnable);
mMediaRecorder.reset();
// 釋放recorder對象
mMediaRecorder.release();
mMediaRecorder = null;
// 為后續使用鎖定攝像頭
mCamera.lock();
}
}
private void releaseCamera() {
if (mCamera != null) {
// 為其它應用釋放攝像頭
mCamera.release();
mCamera = null;
}
}
// SurfaceHolder.Callback接口
public void surfaceCreated(SurfaceHolder holder) {
try {
} catch (IllegalStateException e) {
e.printStackTrace();
}
}
// ?在 surfaceChanged以后，才在?initMediaRecorder()方法里?MediaRecorder 變量設置參數，不然 會在
//mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); 出報錯。
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
System.out.println("SurfaceView---->Changed");
}
public void surfaceDestroyed(SurfaceHolder holder) {
System.out.println("SurfaceView---->Destroyed");
if (mMediaRecorder != null) {
mMediaRecorder.stop();
mMediaRecorder.release();
mMediaRecorder = null;
}
}
}
3,record_mp4.xml
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/solid_white" >
android:id="@+id/camera_preview"
android:layout_width="match_parent"
android:layout_height="match_parent" >
android:id="@+id/etsound_rlcontent"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:background="@color/transparent"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true"
android:visibility="visible" >
android:id="@+id/recor_mp4_left_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:textColor="@color/titlebar_bg"
android:text="20s"
android:textSize="25sp" />
android:id="@+id/etsound_playstop_fl"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:background="@drawable/round_video" >
android:id="@+id/etsound_playstop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="@drawable/play_video_stop_selector"
android:button="@null"
android:padding="10dp" />
原文：http://www.cnblogs.com/lsc183/p/3823338.html
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