下面的代碼是用於捕捉一個圖像,並將它保存到手機圖像目錄。如何修改代碼在內存中創建一個新的文件夾,然後再保存捕捉的圖像,再在主屏中顯示所有的圖像。
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 );
}
}
創建一個 ExternalStorage 中的特殊目錄,把所有的文件保存到那個文件夾中。檢索所有文件夾中的文件,並且在 Listview 或者 Gridview 中顯示。如果你想顯示很多圖像,但要使用同一目錄,最後用 currentTimeInMillis()生成文件名。
_path = Environment.getExternalStorageDirectory() + "/images
/make_machine_example.jpg";
也可以用下面的代碼替代上面
_path = Environment.getExternalStorageDirectory() + "/images
/"+System.currentTimeMillis()+".jpg";
添加的代碼來創建目錄:
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();
}
不要忘記添加權限:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />