Android从零开始(26)(设置全屏+横屏、相机拍照、视频录制)(新)

相机拍照、视频录制相机拍照

全屏显示有两种方式：

在androidManifest.xml里面的application标签下设置

android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"全屏显示

Java代码

[java]
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//指定Activity没有标题（一定要在setContentView之前调用）
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
//全屏显示
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

设置横屏

在androidManifest.xml里面的activity标签下设置

android:screenOrientation="landscape"横屏显示

相机代码

[java]
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/** surfaceview的创建是在Activity完全显示之后，才创建
* 只能使用回调监听
* */

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//指定Activity没有标题（一定要在setContentView之前调用）
requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.main);
//全屏显示
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

surfaceview = (SurfaceView) findViewById(R.id.surfaceview);
// 通过holder来设置surfaceview的参数
SurfaceHolder holder = surfaceview.getHolder();
// 设置显示固定大小
holder.setFixedSize(176, 144);
// 不要让SurfaceView 缓存数据，直接输出
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

//保持屏幕的高亮
surfaceview.setKeepScreenOn(true);

//添加Surfaceview的创建监听
holder.addCallback(new MyCallback());

}

private class MyCallback implements Callback{
@Override
public void surfaceCreated(SurfaceHolderholder) {
//TODO Auto-generated method stub
try{
//得到相机对象
camera = Camera.open();
//相机的参数
Parameters parameters =camera.getParameters();
Log.i("i",parameters.flatten());

//设置预览显示
camera.setPreviewDisplay(holder);
//开始预览
camera.startPreview();
}catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolderholder, int format, int width,
int height) {
//TODO Auto-generated method stub

}
@Override
public voidsurfaceDestroyed(SurfaceHolder holder) {
//TODO Auto-generated method stub
if(camera!= null){
camera.release();
camera= null;
}
}

}

//对焦都是由硬件直接完成
public void foucs(View v){
camera.autoFocus(null);
}

public void take(View v){
/**
*shutter,快门
*raw, 相机捕获的原始数据
*jpeg 相机处理后的数据
*/
camera.takePicture(null, null, newMyPictureCallback());
}

private class MyPictureCallback implements PictureCallback{
@Override
public void onPictureTaken(byte[] data,Camera camera) {
//TODO Auto-generated method stub
try{
File file = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis()+".jpg");
FileOutputStream fos = newFileOutputStream(file);
fos.write(data);
fos.close();

//处理照片的时候，相机被占用了。要想重新预览，就开始预览
camera.startPreview();

}catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();

}

}

所需权限：

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<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<uses-permission android:name="android.permission.CAMERA"/>

视频录制

[java]
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public class MainActivity extends Activity{
private SurfaceView surfaceview;
privateMediaRecorder mr;
privateButton bt_start;
privateButton bt_stop;
/**Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

surfaceview = (SurfaceView) findViewById(R.id.surfaceview);

bt_start = (Button) findViewById(R.id.bt_start);
bt_stop = (Button) findViewById(R.id.bt_stop);

SurfaceHolder holder = surfaceview.getHolder();
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
holder.setFixedSize(176, 144);

surfaceview.setKeepScreenOn(true);

}

public void start(View v){
try {
mr = new MediaRecorder();
mr.reset();

mr.setAudioSource(AudioSource.MIC);
mr.setVideoSource(VideoSource.CAMERA);

mr.setOutputFormat(OutputFormat.THREE_GPP);

mr.setAudioEncoder(AudioEncoder.AMR_NB);
mr.setVideoEncoder(VideoEncoder.H264);

Filefile = new File(Environment.getExternalStorageDirectory(),System.currentTimeMillis()+".3gp");
mr.setOutputFile(file.getAbsolutePath());

//设置预览显示
mr.setPreviewDisplay(surfaceview.getHolder().getSurface());

mr.prepare();
mr.start();

bt_start.setEnabled(false);
bt_stop.setEnabled(true);
} catch (Exception e) {
//TODO Auto-generated catch block
e.printStackTrace();
}
}
public void stop(View v){
mr.stop();
bt_start.setEnabled(true);
bt_stop.setEnabled(false);
}

@Override
protected voidonDestroy() {
//TODO Auto-generated method stub
super.onDestroy();

if(mr!= null){
mr.release();
mr = null;
}
}
}

所需权限：

[html]
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<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>

课后问题

怎么设置全屏显示

全屏显示有两种方式：

在androidManifest.xml里面的application标签下设置

android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"全屏显示

Java代码

//指定Activity没有标题（一定要在setContentView之前调用）

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.main);

//全屏显示

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

怎么设置横屏显示

设置横屏

在androidManifest.xml里面的activity标签下设置

android:screenOrientation="landscape"横屏显示

Camer在使用的是是否需要权限

需要

使用哪个类可以完成视频的刻录

MediaRecorder