Android之简单的拍照功能

canara

package zking.com.g150825_android_playvideo;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class camera extends Activity {

private Button take;
private SurfaceView ca;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
take = (Button) findViewById(R.id.takephoto);
ca = (SurfaceView) findViewById(R.id.camerap);

ca.getHolder().addCallback(new SurfaceHolder.Callback() {

private Camera camera;

@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
camera = Camera.open();
Camera.Parameters parameters=camera.getParameters();
parameters.setPreviewFormat(PixelFormat.JPEG);
parameters.set("jpeg-quality",85);
camera.setParameters(parameters);

try {
camera.setPreviewDisplay(ca.getHolder());
camera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}

@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {

}

@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {

}
});

take.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

//将字节数组转成图片
//实例化输出流对象，将bytes写入即可

//压缩
//将字节数组转成图片
Bitmap bitmap=BitmapFactory.decodeByteArray(bytes,0,bytes.length);
try {
FileOutputStream fos=new FileOutputStream("/mnt/sdcard/Movies/mv"+System.currentTimeMillis()+".png");
bitmap.compress(Bitmap.CompressFormat.PNG,85,fos);

camera.stopPreview();
camera.startPreview();

} catch (FileNotFoundException e) {
e.printStackTrace();
}

}
});

}

}

activity_camera

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="zking.com.g150825_android_playvideo.camera">

<SurfaceView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/camerap"
/>

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="拍照"
android:id="@+id/takephoto"
/>

</RelativeLayout>


最后不要忘记添加相机的权限：

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