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我正在单击按钮创建一个对话框。为此，我创建了一个扩展 Dialog 的类。我为每个文本视图创建了一个 XML 文件，其中包含该 XML 文件中的选项（都是文本视图 [7 文本视图]）我定义了一个标签 android:onClick="imageProcessingHandler"。当我单击活动中的按钮时，它会打开一个很好的对话框。现在，当我单击任何文本视图时，我收到一个错误，即未定义函数。我在类中将此函数定义为扩展 Dialog 的 public。有人可以帮忙吗？

如果我想访问 Imageview，还有一件事；在扩展对话框的类中，从打开对话框的活动中，我该怎么做呢？我正在尝试执行以下操作： ImageView imgView = (ImageView) findViewById(R.id.fullphoto); 但在这种情况下 imgView 包含空值:(

代码：

从按钮上的活动“MyActivity”单击我正在创建一个对象：

ShowOptionsInDialog displayDialog = new ShowOptionsInDialog(this, passedData);
displayDialog.show();

ShowOptionsInDialog 类：

public class ShowOptionsInDialog extends Dialog{

private Context context;

public ShowOptionsInDialog(Context context, ArrayList<String> data) {
    super(context);
    this.context = (Context) context;
}

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

    setContentView(R.layout.imageprocessingoptions);
    setTitle("Try options");
}

public void imageProcessingHandler(View view){
ImageView photo = (ImageView) findViewById(R.id.fullphoto);
}

图像处理选项.XML

<TextView
    android:id="@+id/invertColorText"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:cursorVisible="false"
    android:paddingLeft="10dp"
    android:paddingBottom="5dp"
    android:gravity="bottom"
    android:text="Invert Color"
    android:textSize="15dp"
    android:clickable="true"
    android:onClick="imageProcessingHandler" />

活动代码：

public class PhotoHandler extends Activity {
private Bundle intentExtra;
private String photoID;

private CommomObject _commonObject;
private Facebook facebook;

private ImageView photo;
private DownloadImageTask downlaodImageTask;

private ProgressDialog progDialog;

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

    intentExtra = getIntent().getExtras();
    photoID = intentExtra.getString("PHOTO_ID");

    displayPhoto();
}

private void displayPhoto() {
    _commonObject = CommomObject.getInstance();
    facebook = _commonObject.getFacebookInstance();
    String imageURL = "https://graph.facebook.com/"+photoID+"/picture?type=normal&access_token="+facebook.getAccessToken();
    photo = (ImageView) findViewById(R.id.fullphoto);
    photo.setTag(imageURL);
    photo.setScaleType(ScaleType.FIT_CENTER);
    downlaodImageTask = new DownloadImageTask();
    progDialog = new ProgressDialog(this);
    progDialog.setMessage("Fetching photo...");
    progDialog.show();
    downlaodImageTask.execute(photo);
}

public class DownloadImageTask extends AsyncTask<ImageView, Void, Bitmap>{
    ImageView imageView = null;

    @Override
    protected Bitmap doInBackground(ImageView... imageViews){
        this.imageView = imageViews[0];
        return downloadImage((String)imageView.getTag());
    }

    @Override
    protected void onPostExecute(Bitmap result) {
        imageView.setImageBitmap(result);
    }

    private Bitmap downloadImage(String url) {

        Bitmap photo = null;

        try {

            URL u = new URL(url);
            URLConnection c = u.openConnection();
            c.connect();
            BufferedInputStream stream = new BufferedInputStream(c.getInputStream());
            photo = BitmapFactory.decodeStream(stream);
            stream.close();

        } catch (MalformedURLException e) {
            Log.e("PhotoHandler", "malformed url: " + url);
        } catch (IOException e) {
            Log.e("PhotoHandler", "An error has occurred downloading the image: " + url);
        }
        progDialog.dismiss();
        return photo;
    }
}

public void footerHandler(View view){
    switch(view.getId()){
    case R.id.useButton:
        break;
    case R.id.saveButton:
        break;
    case R.id.shareButton:
        break;
    case R.id.photoEffect:
        ArrayList<String> passedData = new ArrayList<String>();
        ShowOptionsInDialog displayDialog = new ShowOptionsInDialog(this, passedData);
        displayDialog.show();
        break;
    }
}

public void imageProcessingHandler(View view){
    switch(view.getId()){
    case R.id.invertColorText:
        Bitmap newBitmap = ImageProcessing.doInvert(photo.getDrawingCache());
        photo.setImageBitmap(newBitmap);
        break;
    case R.id.greyScaleText:
        break;
    case R.id.gammaCorrectionText:
        break;
    case R.id.sepiaEffectText:
        break;
    case R.id.embossingEffectText:
        break;
    case R.id.reflectionEffectText:
        break;
    case R.id.contrastText:
        break;
    }
}
}
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2 回答 2

0

我在我的代码中实现 onCliclk 监听器为：

TextView invert = (TextView) findViewById(R.id.invertColorText);
invert.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
 // do your work here
});

为了在 Dialog 上获取 ImageView，我从活动中将它传递给 Dailog。

于 2012-04-18T04:54:30.957 回答
0

1 - 你需要把你public void abcFunction(View view)的 Dialog 课。

2 - 使用yourdialog.findViewById(R.id.fullphoto);

于 2012-04-17T12:02:23.307 回答