Android開發: 通過Intent 調用Camera應用 sample code

Sample code，實現簡單應用界面包含兩個button,點擊button 分別打開camera, 和cameroder，主界面如下圖所示

1. 在AndroidManifest.xml文件中包含camera 相關的權限

AndroidManifest.xml

<?xml version= "1.0" encoding ="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="android.study.sample"
    android:versionCode= "1"
    android:versionName= "1.0" >

    <uses-sdk android:minSdkVersion= "15" />
    <uses-permission android:name= "android.permission.CAMERA" />
    <uses-permission android:name= "android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name="android.study.sample.CameraIntentActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application >

</manifest>


-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
res/layout/main.xml

<? xml version= "1.0" encoding = "utf-8"?>
< RelativeLayout xmlns:android ="http://schemas.android.com/apk/res/android"
    android:layout_width= "match_parent"
    android:layout_height= "match_parent" >

    <Button
        android:id ="@+id/buttonTakePic"
        android:layout_width ="match_parent"
        android:layout_height ="wrap_content"
        android:layout_alignParentTop ="true"
        android:layout_centerHorizontal ="true"
        android:layout_marginTop ="100dp"
        android:text ="takepicture" />

    <Button
        android:id ="@+id/buttonRecordVideo"
        android:layout_width ="match_parent"
        android:layout_height ="wrap_content"
        android:layout_alignParentLeft ="true"
        android:layout_alignParentTop ="true"
        android:layout_marginTop ="42dp"
        android:text ="recordvideo" />

</ RelativeLayout>


------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
android.study.sample/CameraIntentActivity.java


package android.study.sample;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;


import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class CameraIntentActivity extends Activity{


        public static final int MEDIA_TYPE_IMAGE = 1;
        public static final int MEDIA_TYPE_VIDEO = 2;

        private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 100;
        private static final int CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE = 200;
        private Uri fileUri ;

       Button takePicureButton;
       Button recordVideoButton;

       OnClickListener cameraButtonListenser =  new OnClickListener(){

               public void onClick(View view) {
                      // TODO Auto-generated method stub

                     Intent intent = null;

                      if(((Button)view).equals(takePicureButton )){

                         // create Intent to take a picture and return control to the calling application
                         intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

                         fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); // create a file to save the p_w_picpath
                         intent.putExtra(MediaStore. EXTRA_OUTPUT, fileUri ); // set the p_w_picpath file name

                        // start the video record Intent
                         startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE );

                     } else if (((Button)view).equals(recordVideoButton)){

                         intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);

                         fileUri = getOutputMediaFileUri(MEDIA_TYPE_VIDEO); // create a file to save the video
                         intent.putExtra(MediaStore. EXTRA_OUTPUT, fileUri ); // set the video file name


                         startActivityForResult(intent, CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE );
                     }
              }

       };

        @Override
        public void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout. main);

           takePicureButton = (Button)findViewById(R.id.buttonTakePic);
           recordVideoButton = (Button)findViewById(R.id.buttonRecordVideo);


           takePicureButton.setOnClickListener(cameraButtonListenser );
           recordVideoButton.setOnClickListener(cameraButtonListenser );

       }

        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
           if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
               if (resultCode == RESULT_OK) {
                   // Image captured and saved to fileUri specified in the Intent


                      if(data!=null ){

                          Toast. makeText(this, "Image saved to:\n" +
                                   data.getData().toString(), Toast.LENGTH_LONG).show();
                     } else{
                            System. out.println("can't get any data!!!" );
                     }

               } else if (resultCode == RESULT_CANCELED) {
                   // User cancelled the p_w_picpath capture
               } else {
                   // Image capture failed, advise user
               }
           }

           if (requestCode == CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE) {
               if (resultCode == RESULT_OK) {
                   // Video captured and saved to fileUri specified in the Intent
                      if(data!=null ){

                          Toast. makeText(this, "Image saved to:\n" +
                                   data.getData().toString(), Toast.LENGTH_LONG).show();

                     } else{

                            System. out.println("can't get any data!!!" );

                     }
               } else if (resultCode == RESULT_CANCELED) {
                   // User cancelled the video capture
               } else {
                   // Video capture failed, advise user
               }
           }
       }


        /** Create a file Uri for saving an p_w_picpath or video */
        private static Uri getOutputMediaFileUri(int type){
             return Uri.fromFile( getOutputMediaFile(type));
       }

        /** Create a File for saving an p_w_picpath or video */
        private static File getOutputMediaFile(int type){
           // To be safe, you should check that the SDCard is mounted
           // using Environment.getExternalStorageState() before doing this.

           File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
                     Environment. DIRECTORY_PICTURES), "MyCameraApp" );
           // This location works best if you want the created p_w_picpaths to be shared
           // between applications and persist after your app has been uninstalled.

           // Create the storage directory if it does not exist
           if (! mediaStorageDir.exists()){
               if (! mediaStorageDir.mkdirs()){
                   Log. d("MyCameraApp", "failed to create directory");
                   return null ;
               }
           }

           // Create a media file name
           String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss" ).format(new Date());
           File mediaFile;
           if (type == MEDIA_TYPE_IMAGE){
               mediaFile = new File(mediaStorageDir.getPath() + File.separator +
               "IMG_"+ timeStamp + ".jpg" );
           } else if (type == MEDIA_TYPE_VIDEO) {
               mediaFile = new File(mediaStorageDir.getPath() + File.separator +
               "VID_"+ timeStamp + ".mp4" );
           } else {
               return null ;
           }

           return mediaFile;
       }
}