如何从相机拍摄图像中的Andr​​oid？ [英] how to capture image from Camera in Android?

问题描述

我做了一个应用程序从相机拍摄的照片。

I have made an application to capture photos from the camera.

我已经创建了两个活动：活动1有一个按钮，启动相机wehen被点击。当图像被捕获，它被传递给活性2。

I have created two Activities: In Activity1 there is one Button which starts the camera wehen it is clicked. When the image is captured, it is passed to Activity2.

然而，当我运行应用程序并启动活动1（与一个Button），我按一下按钮来启动它显示出消息不幸的是，相机已停止弹出窗口的摄像头。有在日志猫或在控制台上没有任何错误。

However, when I run the application and start the Activity1 (with the one Button) and I click on the button to start the camera it displays a pop up window showing the message "Unfortunately, camera has stopped". There are no errors in the log-cat or on the console.

谁能帮助我。请。非常感谢。

Can anyone help me. Please. Thanks a lot.

推荐答案

请尝试以下code：

package com.example.sample1;


import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;



import android.os.Bundle;
import android.os.Environment;
import android.os.StatFs;
import android.provider.MediaStore;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class CapturePhotoSample1 extends Activity implements OnClickListener
{


    public static final int TAKE_PHOTO=1; 
    ImageView imageView=null;

    private File folder;
    String imageFileName=null;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_capture_photo_sample1);

        Button button=(Button)this.findViewById(R.id.capture_button);
        button.setOnClickListener(this);
        button=null;

        imageView=(ImageView)this.findViewById(R.id.image_view1);

        folder = new File(getExternalFilesDir(Environment.DIRECTORY_PICTURES)+ "/sample1/");
        if (!folder.exists()) {
            folder.mkdir();
        }


    }

    private void dispatchTakePictureIntent(int actionCode) {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(takePictureIntent,actionCode);

    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        int id=v.getId();

        if(id==R.id.capture_button)
            this.dispatchTakePictureIntent(TAKE_PHOTO);
    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        MenuInflater inflater = getMenuInflater();

        inflater.inflate(R.menu.menu1, menu);

        return true;

    }

    public void handleCameraPhoto(Intent intent)
    {
        Bundle extras=intent.getExtras();
        Bitmap bitmap=(Bitmap)extras.get("data");
        this.imageView.setImageBitmap(bitmap);

        if(this.isExternalStorageAvailable())
        {
            this.imageFileName="img_"+SDUtil.now(-1)+".png"; 

                    /*SDUtil.now() is our own library.It is for creating file name with respect to data and time.IF u copy the hole program means sdutil shows error.For that you write a logic for creating a file name. */

            String path=folder+"/"+this.imageFileName;

            FileOutputStream fos=null;
            BufferedOutputStream bos=null;

            try
            {
                fos=new FileOutputStream(path);
                bos=new BufferedOutputStream(fos);
                bitmap.compress(Bitmap.CompressFormat.PNG, 40, bos);
            }
            catch(Exception ex)
            {
                ex.printStackTrace();
            }

            if(bos!=null)
            {
                try
                {
                    bos.flush();
                    //bos.close();
                }
                catch(Exception ex)
                {
                    ex.printStackTrace();
                }
            }

            if(bos!=null)
            {
                try
                {
                    bos.close();
                }
                catch(Exception ex)
                {
                    ex.printStackTrace();
                }
            }


            if(fos!=null)
            {
                try
                {
                    fos.close();
                }
                catch(Exception ex)
                {
                    ex.printStackTrace();
                }

            }

            bos=null;
            fos=null;

        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) 
    {
        super.onActivityResult(requestCode, resultCode, data);

        if(resultCode==Activity.RESULT_OK)
        {
            if(requestCode==TAKE_PHOTO)
            {
                handleCameraPhoto(data);
            }
        }


    }

    private boolean isExternalStorageAvailable() {

        StatFs stat = new StatFs(Environment.getExternalStorageDirectory()
                .getPath());
        double sdAvailSize = (double) stat.getAvailableBlocks()
                * (double) stat.getBlockSize();
        // One binary gigabyte equals 1,073,741,824 bytes.
        double mbAvailable = sdAvailSize / 1048576;

        String state = Environment.getExternalStorageState();
        boolean mExternalStorageAvailable = false;
        boolean mExternalStorageWriteable = false;

        if (Environment.MEDIA_MOUNTED.equals(state)) {
            // We can read and write the media
            mExternalStorageAvailable = mExternalStorageWriteable = true;
        } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
            // We can only read the media
            mExternalStorageAvailable = true;
            mExternalStorageWriteable = false;
        } else {
            // Something else is wrong. It may be one of many other states, but
            // all we need
            // to know is we can neither read nor write
            mExternalStorageAvailable = mExternalStorageWriteable = false;
        }

        if (mExternalStorageAvailable == true
                && mExternalStorageWriteable == true && mbAvailable > 10) {
            return true;
        } else {
            return false;
        }
    }

}

这篇关于如何从相机拍摄图像中的Andr​​oid？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！