在android中使用surfaceview在应用程序中使用相机 [英] Using camera inside an app using surfaceview in android

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本文介绍了在android中使用surfaceview在应用程序中使用相机的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在创建一个应用程序，我可以在其中使用相机，而无需使用默认的手机应用程序。所以我已经使用了一个表面视图，并尝试将其保存到手机上，但是 onPictureTaken 永远不会被调用。完整的代码如下所示：

  package com.example.surfaceviewcamera; 
 
 import java.io.File; 
 import java.io.FileOutputStream; 
 import java.io.IOException; 
 
 import android.graphics.Bitmap; 
 import android.graphics.BitmapFactory; 
 import android.hardware.Camera; 
 import android.os.Bundle; 
 import android.app.Activity; 
 import android.content.Context; 
 import android.content.ContextWrapper; 
 import android.view.Menu; 
 import android.view.SurfaceHolder; 
 import android.view.SurfaceView; 
 import android.view.View; 
 import android.view.View.OnClickListener; 
 import android.widget.Button; 
 import android.widget.Toast; 
 
 public class MainActivity extends Activity implements SurfaceHolder.Callback {
 
 SurfaceView mSurfaceView; 
 SurfaceHolder mSurfaceHolder; 
相机mCamera; 
 boolean mPreviewRunning; 
按钮btncapture; 
 @Override 
 protected void onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 setContentView（R.layout.activity_main）; 
 btncapture =（Button）findViewById（R.id.btncapture）; 
 mSurfaceView =（SurfaceView）findViewById（R.id.surface_camera）; 
 mSurfaceHolder = mSurfaceView.getHolder（）; 
 mSurfaceHolder.addCallback（this）; 
 mSurfaceHolder.setType（SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS）; 
 
 btncapture.setOnClickListener（new OnClickListener（）{
 
 @Override 
 public void onClick（View v）{
 Camera.PictureCallback mPictureCallback = new Camera .PictureCallback（）{
 public void onPictureTaken（byte [] imageData，Camera c）{
 
位图位图= BitmapFactory.decodeByteArray（imageData，0，imageData .length）; 
 String file_path = saveToInternalSorage（bitmap）; 
 Toast.makeText（getApplicationContext（），Image成功存储在+ file_path，Toast.LENGTH_LONG）.show（）; 
} 
 
}; 
 
} 
}）; 
 
} 
 private String saveToInternalSorage（Bitmap bitmapImage）{
 ContextWrapper cw = new ContextWrapper（getApplicationContext（））; 
 //路径到/ data / data / yourapp / app_data / imageDir 
文件目录= cw.getDir（imageDir，Context.MODE_PRIVATE）; 
 //创建imageDir 
文件mypath =新文件（目录，marina1.jpg）; 
 
 FileOutputStream fos = null; 
 try {
 
 fos = new FileOutputStream（mypath）; 
 
 //使用BitMap对象上的compress方法将图像写入OutputStream 
 bitmapImage.compress（Bitmap.CompressFormat.PNG，100，fos）; 
 fos.close（）; 
} catch（Exception e）{
 e.printStackTrace（）; 
} 
 return directory.getAbsolutePath（）; 
} 
 @Override 
 public void surfaceCreated（SurfaceHolder holder）{
 mCamera = Camera.open（）; 
 
 
} 
 
 @Override 
 public void surfaceChanged（SurfaceHolder holder，int format，int w，
 int h）{
 if（mPreviewRunning）{
 mCamera.stopPreview（）; 
} 
 Camera.Parameters p = mCamera.getParameters（）; 
 p.setPreviewSize（w，h）; 
 mCamera.setParameters（p）; 
 try {
 mCamera.setPreviewDisplay（holder）; 
} catch（IOException e）{
 e.printStackTrace（）; 
} 
 mCamera.startPreview（）; 
 mPreviewRunning = true; 
 
} 
 
 
 @Override 
 public void surfaceDestroyed（SurfaceHolder holder）{
 mCamera.stopPreview（）; 
 mPreviewRunning = false; 
 mCamera.release（）; 
 
} 
 
}

我的XML文件：

 < LinearLayout xmlns：android =http://schemas.android.com/apk/res/android
 android：layout_width =fill_parent
 android：layout_height =fill_parent
 android：orientation =vertical> 
 
< SurfaceView 
 android：id =@ + id / surface_camera
 android：layout_width =fill_parent
 android：layout_height =10dip
 android：layout_weight =1> 
< / SurfaceView> 
< Button 
 android：layout_width =wrap_content
 android：layout_height =wrap_content
 android：text =CAPTURE IMAGE
 android：id = @ + id / btncapture
 android：layout_gravity =center
 /> 
< / LinearLayout>


解决方案

调用 camera.takePicture null，null，callback）; from onClick（）并定义 onCreate（）



供参考查看此链接 

  public class MainActivity extends Activity implements SurfaceHolder.Callback { 
 
 SurfaceView mSurfaceView; 
 SurfaceHolder mSurfaceHolder; 
相机mCamera; 
 boolean mPreviewRunning; 
按钮btncapture; 
 @Override 
 protected void onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 setContentView（R.layout.activity_main）; 
 btncapture =（Button）findViewById（R.id.btncapture）; 
 mSurfaceView =（SurfaceView）findViewById（R.id.surface_camera）; 
 mSurfaceHolder = mSurfaceView.getHolder（）; 
 mSurfaceHolder.addCallback（this）; 
 mSurfaceHolder.setType（SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS）; 
 
 btncapture.setOnClickListener（new OnClickListener（）{
 
 @Override 
 public void onClick（View v）{
 //在这里拍照
 mCamera.takePicture（null，null，mPictureCallback）; 
} 
}）; 
} 
 
 Camera.PictureCallback mPictureCallback = new Camera.PictureCallback（）{
 public void onPictureTaken（byte [] imageData，Camera c）{
 
 Bitmap Bitmap = BitmapFactory.decodeByteArray（imageData，0，imageData .length）; 
 String file_path = saveToInternalSorage（bitmap）; 
 Toast.makeText（getApplicationContext（），成功存储在+ file_path，Toast.LENGTH_LONG）.show（）; 
} 
}; 
 
 private String saveToInternalSorage（Bitmap bitmapImage）{
 ContextWrapper cw = new ContextWrapper（getApplicationContext（））; 
 //路径到/ data / data / yourapp / app_data / imageDir 
文件目录= cw.getDir（imageDir，Context.MODE_PRIVATE）; 
 //创建imageDir 
文件mypath =新文件（目录，marina1.jpg）; 
 
 FileOutputStream fos = null; 
 try {
 
 fos = new FileOutputStream（mypath）; 
 
 //使用BitMap对象上的compress方法将图像写入OutputStream 
 bitmapImage.compress（Bitmap.CompressFormat.PNG，100，fos）; 
 fos.close（）; 
} catch（Exception e）{
 e.printStackTrace（）; 
} 
 return directory.getAbsolutePath（）; 
} 
 @Override 
 public void surfaceCreated（SurfaceHolder holder）{
 mCamera = Camera.open（）; 
 
 
} 
 
 @Override 
 public void surfaceChanged（SurfaceHolder holder，int format，int w，
 int h）{
 if（mPreviewRunning）{
 mCamera.stopPreview（）; 
} 
 Camera.Parameters p = mCamera.getParameters（）; 
 p.setPreviewSize（w，h）; 
 mCamera.setParameters（p）; 
 try {
 mCamera.setPreviewDisplay（holder）; 
} catch（IOException e）{
 e.printStackTrace（）; 
} 
 mCamera.startPreview（）; 
 mPreviewRunning = true; 
 
} 
 
 
 @Override 
 public void surfaceDestroyed（SurfaceHolder holder）{
 mCamera.stopPreview（）; 
 mPreviewRunning = false; 
 mCamera.release（）; 
 
} 
 
}


I am creating an app where i can use the camera inside it without going to the default app of the phone.So i have used a surface view and tried to save it onto the phone, but the onPictureTaken never gets called.The complete code is shown below:

package com.example.surfaceviewcamera;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.hardware.Camera;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.ContextWrapper;
import android.view.Menu;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements SurfaceHolder.Callback {

    SurfaceView mSurfaceView;
    SurfaceHolder mSurfaceHolder;
    Camera mCamera;
    boolean mPreviewRunning;
    Button btncapture;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btncapture=(Button) findViewById(R.id.btncapture);
        mSurfaceView = (SurfaceView) findViewById(R.id.surface_camera);
        mSurfaceHolder = mSurfaceView.getHolder();
        mSurfaceHolder.addCallback(this);
        mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        btncapture.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {
                    public void onPictureTaken(byte[] imageData, Camera c) {

                        Bitmap bitmap = BitmapFactory.decodeByteArray(imageData , 0, imageData .length);
                        String file_path=saveToInternalSorage(bitmap);
                        Toast.makeText(getApplicationContext(),"Image stored succesfully at "+file_path,Toast.LENGTH_LONG).show();
                    }

                    };

            }
        });

    }
    private String saveToInternalSorage(Bitmap bitmapImage){
        ContextWrapper cw = new ContextWrapper(getApplicationContext());
         // path to /data/data/yourapp/app_data/imageDir
        File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
        // Create imageDir
        File mypath=new File(directory,"marina1.jpg");

        FileOutputStream fos = null;
        try {           

            fos = new FileOutputStream(mypath);

       // Use the compress method on the BitMap object to write image to the OutputStream
            bitmapImage.compress(Bitmap.CompressFormat.PNG, 100, fos);
            fos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return directory.getAbsolutePath();
    }
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        mCamera=Camera.open();


    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int w,
            int h) {
        if (mPreviewRunning) {
            mCamera.stopPreview();
            }
            Camera.Parameters p = mCamera.getParameters();
            p.setPreviewSize(w, h);
            mCamera.setParameters(p);
            try {
            mCamera.setPreviewDisplay(holder);
            } catch (IOException e) {
            e.printStackTrace();
            }
            mCamera.startPreview();
            mPreviewRunning = true;

    }


    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        mCamera.stopPreview();
        mPreviewRunning = false;
        mCamera.release();

    }

}

My XML file:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
 android:layout_height="fill_parent"
android:orientation="vertical">

<SurfaceView
 android:id="@+id/surface_camera"
android:layout_width="fill_parent"
 android:layout_height="10dip"
android:layout_weight="1">
</SurfaceView>
<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="CAPTURE IMAGE"
    android:id="@+id/btncapture"
    android:layout_gravity="center"
    />
</LinearLayout>

解决方案

call camera.takePicture(null, null, callback); from onClick() and define the callback outside the onCreate()

for reference look into this link

public class MainActivity extends Activity implements SurfaceHolder.Callback {

    SurfaceView mSurfaceView;
    SurfaceHolder mSurfaceHolder;
    Camera mCamera;
    boolean mPreviewRunning;
    Button btncapture;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btncapture=(Button) findViewById(R.id.btncapture);
        mSurfaceView = (SurfaceView) findViewById(R.id.surface_camera);
        mSurfaceHolder = mSurfaceView.getHolder();
        mSurfaceHolder.addCallback(this);
        mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        btncapture.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                //take picture here
                mCamera.takePicture(null, null, mPictureCallback);
            }
        });
    }

    Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {
        public void onPictureTaken(byte[] imageData, Camera c) {

            Bitmap bitmap = BitmapFactory.decodeByteArray(imageData , 0, imageData .length);
            String file_path=saveToInternalSorage(bitmap);
            Toast.makeText(getApplicationContext(),"Image stored succesfully at "+file_path,Toast.LENGTH_LONG).show();
        }
    };

    private String saveToInternalSorage(Bitmap bitmapImage){
        ContextWrapper cw = new ContextWrapper(getApplicationContext());
         // path to /data/data/yourapp/app_data/imageDir
        File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
        // Create imageDir
        File mypath=new File(directory,"marina1.jpg");

        FileOutputStream fos = null;
        try {           

            fos = new FileOutputStream(mypath);

       // Use the compress method on the BitMap object to write image to the OutputStream
            bitmapImage.compress(Bitmap.CompressFormat.PNG, 100, fos);
            fos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return directory.getAbsolutePath();
    }
    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        mCamera=Camera.open();


    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int w,
            int h) {
        if (mPreviewRunning) {
            mCamera.stopPreview();
            }
            Camera.Parameters p = mCamera.getParameters();
            p.setPreviewSize(w, h);
            mCamera.setParameters(p);
            try {
            mCamera.setPreviewDisplay(holder);
            } catch (IOException e) {
            e.printStackTrace();
            }
            mCamera.startPreview();
            mPreviewRunning = true;

    }


    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        mCamera.stopPreview();
        mPreviewRunning = false;
        mCamera.release();

    }

}

这篇关于在android中使用surfaceview在应用程序中使用相机的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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