2

これは、画像を取得して電話の画像ディレクトリに保存する私のコードです。このコードを変更して、メモリに新しいフォルダーを作成し、キャプチャした画像をそこに保存し、すべての画像をメイン画面に表示するにはどうすればよいですか。このガイドに従いました。

package makemachine.android.examples;

import java.io.File;
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 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() + "/images 
  /make_machine_example.jpg";
}

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 );
}
}
4

2 に答える 2

3

このコードは機能しています

public class MainActivity extends ActionBarActivity {

    protected Button _button;
    protected ImageView _image;
    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.activity_main);

        _image = ( ImageView ) findViewById( R.id.imageView );
        _button = ( Button ) findViewById( R.id.buttonCapture );
        _button.setOnClickListener((android.view.View.OnClickListener) new ButtonClickHandler());

        _path = Environment.getExternalStorageDirectory() + "/MyFolder/"+System.currentTimeMillis()+".jpg";
    }

    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);


    }

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

    @Override
    protected void onSaveInstanceState( Bundle outState ) {
        outState.putBoolean( MainActivity.PHOTO_TAKEN, _taken );
    }
}
于 2015-02-27T06:44:43.910 に答える
1

ねえ、ExternalStorageに必要に応じて特別なディレクトリを作成し、すべてのファイルをそのフォルダに保存します。そのフォルダからすべてのファイルを取得し、ListviewまたはGridviewに表示します。多くの画像を表示したいが同じディレクトリを使用したいので、currentTimeInMillis（）でファイル名を生成する方が良いでしょう。

_path = Environment.getExternalStorageDirectory() + "/images 
  /make_machine_example.jpg";

上の線の代わりに下の線を使用してください

_path = Environment.getExternalStorageDirectory() + "/images 
  /"+System.currentTimeMillis()+".jpg";

ディレクトリを作成するためのコードの追加：

File dir = new File("path/to/your/directory");
try{
  if(dir.mkDir()) {
     System.out.println("Directory created");
  } else {
     System.out.println("Directory is not created");
}catch(Exception e){
  e.printStacktrace();
}

権限を追加することを忘れないでください

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
于 2012-12-11T12:51:13.243 に答える