android - 如何在手机内存中创建文件夹并保存图像。

Question

如何在手机内存中创建新文件夹“MyFolder”并将所有捕获的图像保存在该文件夹中？请帮我。以下代码将所有图像保存到手机的默认图像库。我想创建新文件夹并将所有捕获的图像保存在该文件夹中。我该怎么办？

    public class PhotoCaptureExample extends Activity 
  {
protected Button _button;
protected ImageView _image;
protected TextView _field;
protected String _path;
protected boolean _taken;

protected static final String PHOTO_TAKEN   = "photo_taken";

 @Override
  public void onCreate(Bundle savedInstanceState) 
 {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);

    _image = ( ImageView ) findViewById( R.id.image );
    _field = ( TextView ) findViewById( R.id.field );
    _button = ( Button ) findViewById( R.id.button );
    _button.setOnClickListener( new ButtonClickHandler() );
   ;
  _path = Environment.getExternalStorageDirectory() + "/myfolder   
 /"+System.currentTimeMillis()+".jpg";




    File dir = new File(_path );
    try{
      if(dir.mkdir()) {
         System.out.println("Directory created");
      } 
      else {
         System.out.println("Directory is not created");
      }}
      catch(Exception e){

    }  



















}

public class ButtonClickHandler implements View.OnClickListener 
{
    public void onClick( View view ){
        Log.i("MakeMachine", "ButtonClickHandler.onClick()" );
        startCameraActivity();
    }
}

protected void startCameraActivity()
{
    Log.i("MakeMachine", "startCameraActivity()" );
    File file = new File( _path );
    Uri outputFileUri = Uri.fromFile( file );

    Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
    intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );

    startActivityForResult( intent, 0 );
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{   
    Log.i( "MakeMachine", "resultCode: " + resultCode );
    switch( resultCode )
    {
        case 0:
            Log.i( "MakeMachine", "User cancelled" );
            break;

        case -1:
            onPhotoTaken();
            break;
    }
}

protected void onPhotoTaken()
{
    Log.i( "MakeMachine", "onPhotoTaken" );

    _taken = true;

    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = 4;

    Bitmap bitmap = BitmapFactory.decodeFile( _path, options );

    _image.setImageBitmap(bitmap);

    _field.setVisibility( View.GONE );
}

@Override 
protected void onRestoreInstanceState( Bundle savedInstanceState){
    Log.i( "MakeMachine", "onRestoreInstanceState()");
    if( savedInstanceState.getBoolean( PhotoCaptureExample.PHOTO_TAKEN ) ) {
        onPhotoTaken();
    }
}

@Override
protected void onSaveInstanceState( Bundle outState ) {
    outState.putBoolean( PhotoCaptureExample.PHOTO_TAKEN, _taken );
}
}

Answer 1

检查这是否有帮助，

File mydir = context.getDir("mydir", Context.MODE_PRIVATE); //Creating an internal dir;
File fileWithinMyDir = new File(mydir, "myfile"); //Getting a file within the dir.
FileOutputStream out = new FileOutputStream(fileWithinMyDir); //Use the stream as usual to write into the file.

Answer 2

您需要在清单文件中具有以下权限才能创建文件夹。

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />  

更新 ：

package com.test;

import java.io.File;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;


public class CameraTest extends Activity 
{
    protected Button _button;
    protected ImageView _image;
    protected TextView _field;
    protected String _path;
    protected boolean _taken;

protected static final String PHOTO_TAKEN   = "photo_taken";

 @Override
  public void onCreate(Bundle savedInstanceState) 
 {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.camtest);

    _image = ( ImageView ) findViewById( R.id.image );
    _field = ( TextView ) findViewById( R.id.field );
    _button = ( Button ) findViewById( R.id.button );
    _button.setOnClickListener( new ButtonClickHandler() );
   // _path = Environment.getExternalStorageDirectory() + "/NewFolder/"+System.currentTimeMillis()+".jpg";

    _path = "/sdcard/NewFolder/test1.jpg";


    String dir = "/sdcard/NewFolder/";
    File imageDirectory = new File(dir);
    imageDirectory.mkdirs();

   /* File dir = new File(_path );
    try{
      if(dir.mkdir()) {
         System.out.println("Directory created");
      } 
      else {
         System.out.println("Directory is not created");
      }}
      catch(Exception e){

    }  */
}

public class ButtonClickHandler implements View.OnClickListener 
{
    public void onClick( View view ){
        Log.i("MakeMachine", "ButtonClickHandler.onClick()" );
        startCameraActivity();
    }
}

protected void startCameraActivity()
{
    Log.i("MakeMachine", "startCameraActivity()" );
    File file = new File( _path );
    Uri outputFileUri = Uri.fromFile( file );

    Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
    intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );

    startActivityForResult( intent, 0 );
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{   
    Log.i( "MakeMachine", "resultCode: " + resultCode );
    switch( resultCode )
    {
        case 0:
            Log.i( "MakeMachine", "User cancelled" );
            break;

        case -1:
            onPhotoTaken();
            break;
    }
}

protected void onPhotoTaken()
{
    Log.i( "MakeMachine", "onPhotoTaken" );

    _taken = true;

    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = 4;

    Bitmap bitmap = BitmapFactory.decodeFile( _path, options );

    _image.setImageBitmap(bitmap);

    _field.setVisibility( View.GONE );
}


}

这对我来说非常有效。

使用此代码查看。

希望这对您有所帮助。

谢谢。

Answer 3

代码应该可以使用，但是要注意先创建这个目录。