源碼：
package com.example.myvideocamera;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.Size;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
/**
* 視頻錄製
*/
@SuppressWarnings("deprecation")
public class MainActivity extends Activity implements OnClickListener,
SensorEventListener, Callback {
private SurfaceView surfaceView; // 用於繪製緩衝圖像的
private Button luXiang_bt; // 開始錄製的按鈕
private Button tingZhi_bt; // 停止錄製的按鈕
private Button auto_focus; // 進行對焦
private Button screenshot; // 截圖
private TextView time_tv; // 顯示時間的文本框
private MediaRecorder mRecorder;
private boolean recording; // 記錄是否正在錄像,fasle爲未錄像, true 爲正在錄像
private File videoFolder; // 存放視頻的文件夾
private File videFile; // 視頻文件
private Handler handler;
private int time; // 時間
private Camera myCamera; // 相機聲明
private SurfaceHolder holder; // 用來訪問surfaceview的接口
private SensorManager sManager; // 傳感器管理者
private Sensor sensor; // 傳感器對象
private int mX, mY, mZ; // x y z 座標
private Calendar calendar; // 日曆
private long lasttimestamp = 0; // 上一次用時的標誌
/**
* 錄製過程中,時間變化
*/
private Runnable timeRun = new Runnable() {
@Override
public void run() {
time++;
time_tv.setText(time + "秒");
handler.postDelayed(timeRun, 1000);
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);// 強制橫屏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
initView();
initSensor();
initCreateFile();
}
/**
* 對傳感器進行初始化
*/
private void initSensor() {
sManager = (SensorManager) getSystemService(SENSOR_SERVICE);
sensor = sManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
if (sManager == null) {
// throw new IllegalArgumentException("SensorManager is null");
}
sManager.registerListener(this, sensor,
SensorManager.SENSOR_DELAY_NORMAL);
}
/**
* 文件的創建
*/
private void initCreateFile() {
// 判斷sd卡是否存在
boolean sdCardExist = Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
if (sdCardExist) {
// 設定存放視頻的文件夾的路徑
String path = Environment.getExternalStorageDirectory()
.getAbsolutePath()
+ File.separator
+ "VideoFolder"
+ File.separator;
// 聲明存放視頻的文件夾的File對象
videoFolder = new File(path);
// 如果不存在此文件夾,則創建
if (!videoFolder.exists()) {
videoFolder.mkdirs();
}
// 設置surfaceView不管理的緩衝區
surfaceView.getHolder().setType(
SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
// 設置surfaceView分辨率
//surfaceView.getHolder().setFixedSize(1000, 500);
luXiang_bt.setOnClickListener(this);
} else
Toast.makeText(this, "未找到sdCard!", Toast.LENGTH_LONG).show();
}
/**
* 初始化工作
*/
private void initView() {
// 獲取控件
surfaceView = (SurfaceView) findViewById(R.id.surfaceview);
luXiang_bt = (Button) findViewById(R.id.luXiang_bt);
tingZhi_bt = (Button) findViewById(R.id.tingZhi_bt);
time_tv = (TextView) findViewById(R.id.time);
auto_focus = (Button) findViewById(R.id.auto_focus);
screenshot = (Button) findViewById(R.id.screenshot);
handler = new Handler();
holder = surfaceView.getHolder();
tingZhi_bt.setOnClickListener(this);
auto_focus.setOnClickListener(this);
screenshot.setOnClickListener(this);
// 添加回調
holder.addCallback(this);
}
/**
* 將Camera和mediaRecoder釋放
*/
@Override
protected void onDestroy() {
handler.removeCallbacks(timeRun);
if (mRecorder != null) {
mRecorder.release();
}
if (myCamera != null) {
myCamera.stopPreview();
myCamera.release();
}
super.onDestroy();
}
/**
* 控件點擊事件的監聽
*/
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.luXiang_bt: // 錄像點擊事件
if (!recording) {
try {
// 獲取當前時間,作爲視頻文件的文件名
String nowTime = java.text.MessageFormat.format(
"{0,date,yyyyMMdd_HHmmss}",
new Object[] { new java.sql.Date(System
.currentTimeMillis()) });
// 聲明視頻文件對象
videFile = new File(videoFolder.getAbsoluteFile()
+ File.separator + "video" + nowTime + ".mp4");
// 關閉預覽並釋放資源
myCamera.unlock();
mRecorder = new MediaRecorder();
mRecorder.setCamera(myCamera);
// 創建此視頻文件
videFile.createNewFile();
mRecorder.setPreviewDisplay(surfaceView.getHolder()
.getSurface()); // 預覽
mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); // 視頻源
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); // 錄音源爲麥克風
mRecorder
.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4); // 輸出格式爲mp4
/* 引用android.util.DisplayMetrics 獲取分辨率 */
// DisplayMetrics dm = new DisplayMetrics();
// getWindowManager().getDefaultDisplay().getMetrics(dm);
mRecorder.setVideoSize(800, 480); // 視頻尺寸
mRecorder.setVideoEncodingBitRate(2*1280*720); //設置視頻編碼幀率
mRecorder.setVideoFrameRate(30); // 視頻幀頻率
mRecorder
.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); // 視頻編碼
mRecorder
.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); // 音頻編碼
mRecorder.setMaxDuration(1800000); // 設置最大錄製時間
mRecorder.setOutputFile(videFile.getAbsolutePath()); // 設置錄製文件源
mRecorder.prepare(); // 準備錄像
mRecorder.start(); // 開始錄像
time_tv.setVisibility(View.VISIBLE); // 設置文本框可見
handler.post(timeRun); // 調用Runable
recording = true; // 改變錄製狀態爲正在錄製
setAutofocus();
} catch (IOException e1) {
e1.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
}
} else
Toast.makeText(MainActivity.this, "視頻正在錄製中...",
Toast.LENGTH_LONG).show();
break;
case R.id.tingZhi_bt: // 停止點擊事件
if (recording) {
mRecorder.stop();
mRecorder.release();
handler.removeCallbacks(timeRun);
time_tv.setVisibility(View.GONE);
int videoTimeLength = time;
time = 0;
recording = false;
Toast.makeText(
MainActivity.this,
videFile.getAbsolutePath() + " " + videoTimeLength
+ "秒", Toast.LENGTH_LONG).show();
}
// 開啓相機
if (myCamera == null) {
myCamera = Camera.open();
try {
myCamera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
}
myCamera.startPreview(); // 開啓預覽
break;
case R.id.auto_focus:
setAutofocus();
break;
case R.id.screenshot:
myCamera.autoFocus(new AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
if (success) {
camera.takePicture(null, null, jpegCallBack);
}
}
});
break;
}
}
/**
* 設置自動對焦
*/
private void setAutofocus() {
if (myCamera != null) {
myCamera.autoFocus(new AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
if (success) {
}
}
});
}
}
/**
* 傳感器改變調用的方法
*/
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor == null) {
return;
}
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
int x = (int) event.values[0];
int y = (int) event.values[1];
int z = (int) event.values[2];
calendar = Calendar.getInstance();
long stamp = calendar.getTimeInMillis();
int px = Math.abs(mX - x);
int py = Math.abs(mY - y);
int pz = Math.abs(mZ - z);
int maxValue = getMaxValue(px, py, pz);
if (maxValue > 2 && (stamp - lasttimestamp) > 30) {
lasttimestamp = stamp;
setAutofocus();
}
mX = x;
mY = y;
mZ = z;
}
}
/**
* 獲取最大改變的值
*/
private int getMaxValue(int px, int py, int pz) {
int max = 0;
if (px > py && px > pz) {
max = px;
} else if (py > px && py > pz) {
max = py;
} else if (pz > px && pz > py) {
max = pz;
}
return max;
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
/**
* suraceView 創建執行的操作
*/
@Override
public void surfaceCreated(SurfaceHolder holder) {
// 開啓相機
if (myCamera == null) {
myCamera = Camera.open();
try {
myCamera.setPreviewDisplay(holder);
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* suraceView 狀態改變執行的操作
*/
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// 開始預覽
myCamera.startPreview();
Parameters parameters = myCamera.getParameters();// 獲取mCamera的參數對象
Size largestSize = getBestSupportedSize(parameters
.getSupportedPreviewSizes());
parameters.setPreviewSize(largestSize.width, largestSize.height);// 設置預覽圖片尺寸
largestSize = getBestSupportedSize(parameters
.getSupportedPictureSizes());// 設置捕捉圖片尺寸
parameters.setPictureSize(largestSize.width, largestSize.height);
myCamera.setParameters(parameters);
}
private Size getBestSupportedSize(List<Size> sizes) {
// 取能適用的最大的SIZE
Size largestSize = sizes.get(0);
int largestArea = sizes.get(0).height * sizes.get(0).width;
for (Size s : sizes) {
int area = s.width * s.height;
if (area > largestArea) {
largestArea = area;
largestSize = s;
}
}
return largestSize;
}
/**
* suraceView 銷燬執行的操作
*/
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// 關閉預覽並釋放資源
if (myCamera != null) {
myCamera.stopPreview();
myCamera.release();
myCamera = null;
}
}
/**
* 創建jpeg圖片回調數據對象
*/
private String filepath = "";
private PictureCallback jpegCallBack = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
Bitmap oldBitmap = BitmapFactory.decodeByteArray(data, 0,
data.length);
Matrix matrix = new Matrix();
matrix.setRotate(90);
Bitmap newBitmap = Bitmap.createBitmap(oldBitmap, 0, 0,
oldBitmap.getWidth(), oldBitmap.getHeight(),
matrix, true);
filepath = Environment.getExternalStorageDirectory()
+ File.separator
+ new SimpleDateFormat("yyyyMMddHHmmss").format(new Date())
+ ".jpg";
File file = new File(filepath);
try {
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream(file));
newBitmap.compress(Bitmap.CompressFormat.JPEG, 85, bos);
bos.flush();
bos.close();
camera.stopPreview();
camera.startPreview();
newBitmap.recycle();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
};
}
xml佈局：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff" >
<SurfaceView
android:id="@+id/surfaceview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
<Button
android:id="@+id/tingZhi_bt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:text="停止"/>
<Button
android:id="@+id/luXiang_bt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toLeftOf="@id/tingZhi_bt"
android:text="錄像"/>
<Button
android:id="@+id/auto_focus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toLeftOf="@id/luXiang_bt"
android:text="調焦"/>
<Button
android:id="@+id/screenshot"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_toLeftOf="@id/auto_focus"
android:text="拍照"/>
<TextView
android:id="@+id/time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FF0000"
android:text="1秒"
android:visibility="gone"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="10dp"/>
</RelativeLayout>