Android手機拍照功能的實現

標籤：手機拍照

一、布局檔案main.xml

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent" >    <SurfaceView        android:id="@+id/surfaceView"        android:layout_width="fill_parent"        android:layout_height="fill_parent" />    <RelativeLayout        android:id="@+id/buttonlayout"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:visibility="gone" >        <Button            android:id="@+id/takepicture"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentBottom="true"            android:layout_alignParentRight="true"            android:layout_marginRight="5dp"            android:onClick="takepicture"            android:text="@string/takepicture" />        <Button            android:id="@+id/autofocus"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignTop="@id/takepicture"            android:layout_marginRight="20dp"            android:layout_toLeftOf="@id/takepicture"            android:onClick="takepicture"            android:text="@string/autofocus" />    </RelativeLayout></FrameLayout>

二、MainActivity.java

import java.io.File;import java.io.FileOutputStream;import android.app.Activity;import android.hardware.Camera;import android.hardware.Camera.PictureCallback;import android.os.Bundle;import android.os.Environment;import android.view.MotionEvent;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;import android.view.View;import android.view.ViewGroup;import android.view.Window;import android.view.WindowManager;public class MainActivity extends Activity {    private View layout;    private Camera camera;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,                WindowManager.LayoutParams.FLAG_FULLSCREEN);        setContentView(R.layout.main);        layout = this.findViewById(R.id.buttonlayout);        SurfaceView surfaceView = (SurfaceView) this                .findViewById(R.id.surfaceView);        surfaceView.getHolder()                .setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);        surfaceView.getHolder().setFixedSize(176, 144);        surfaceView.getHolder().setKeepScreenOn(true);        surfaceView.getHolder().addCallback(new SurfaceCallback());    }    public void takepicture(View v) {        if (camera != null) {            switch (v.getId()) {            case R.id.takepicture:                camera.takePicture(null, null, new MyPictureCallback());                break;            case R.id.autofocus:                camera.autoFocus(null);                break;            }        }    }    private final class MyPictureCallback implements PictureCallback {        public void onPictureTaken(byte[] data, Camera camera) {            try {                File jpgFile = new File(                        Environment.getExternalStorageDirectory(),                        System.currentTimeMillis() + ".jpg");                FileOutputStream outStream = new FileOutputStream(jpgFile);                outStream.write(data);                outStream.close();                camera.startPreview();            } catch (Exception e) {                e.printStackTrace();            }        }    }    private final class SurfaceCallback implements Callback {        public void surfaceCreated(SurfaceHolder holder) {            try {                camera = Camera.open();// 開啟網路攝影機                Camera.Parameters parameters = camera.getParameters();                // Log.i("MainActivity", parameters.flatten());                parameters.setPreviewSize(800, 480);                parameters.setPreviewFrameRate(5);                parameters.setPictureSize(1024, 768);                parameters.setJpegQuality(80);                camera.setParameters(parameters);                camera.setPreviewDisplay(holder);                camera.startPreview();// 開始預覽            } catch (Exception e) {                e.printStackTrace();            }        }        public void surfaceChanged(SurfaceHolder holder, int format, int width,                int height) {        }        public void surfaceDestroyed(SurfaceHolder holder) {            if (camera != null) {                camera.release();                camera = null;            }        }    }    @Override    public boolean onTouchEvent(MotionEvent event) {        if (event.getAction() == MotionEvent.ACTION_DOWN) {            layout.setVisibility(ViewGroup.VISIBLE);            return true;        }        return super.onTouchEvent(event);    }}

三、添加許可權

 <uses-permission android:name="android.permission.CAMERA" />    <!-- 在SDCard中建立與刪除檔案許可權 -->    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />    <!-- 往SDCard寫入資料許可權 -->    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

效果如下：

Android手機拍照功能的實現