使用Camera有两种方式:通过Intent方式和通过Camera的API。在开发系列(一) 中已经介绍了通过Intent方式拍照,本文介绍通过Intent的方式录制视频。
通过Itent实现拍录制视频
第一步:在Eclipse中创建一个名为AndroidCamera的Android工程,可参见Helloworld的例子;
第二步:在AndroidManifest.xml中添加使用Camera相关的声明如下:
<uses-feature android:name="android.hardware.camera" android:required="false" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
第三步:编写AndroidCameraActivity类,如下:
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.widget.Toast;
public class AndroidCameraActivity extends Activity {
private static final int CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE = 200;
private Intent intent = null;
private Uri fileUri = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);//create a intent to record video
fileUri = getOutputMediaFileUri(); // create a file Uri to save the video
// set the video file name
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
// set the video quality high
intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
// start the video capture Intent
startActivityForResult(intent, CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE) {
if (resultCode == RESULT_OK) {
// video captured and saved to fileUri specified in the Intent
Toast.makeText(this, "Video saved to:\n" +
data.getData(),
Toast.LENGTH_LONG).show();
} else if (resultCode == RESULT_CANCELED) {
// User cancelled the video capture
}
}
}
/** Create a File Uri for saving a video */
private static Uri getOutputMediaFileUri(){
//get the mobile Pictures directory
File picDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
//get the current time
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File videoFile = new File(picDir.getPath() + File.separator + "VIDEO_"+ timeStamp + ".mp4");
return Uri.fromFile(videoFile);
}
}
第四步:运行程序。
运行程序会出现录制视频的窗口,录制保存后可以即可在SD卡的Pictures目录下找到刚才录制的视频。