Question

我想在屏幕上有3个项目：SeekBar，Background img，Rotatable img。任务：绘制2个图像：仪表和针，然后根据搜索栏进度旋转针。我尝试上传到平板电脑时出现问题

07-10 09:52:13.680: E/AndroidRuntime(30494): java.lang.RuntimeException: 
Unable to start activity ComponentInfo{com.aaa.samples.thermometer/com.aaa.samples.meter.MeterActivity}: 
java.lang.ClassCastException: com.aaa.samples.meter.MeterActivity cannot be cast to android.widget.SeekBar$OnSeekBarChangeListener

尝试了很多不同的设置与relativelayout等没有运气

<SeekBar
    android:id="@+id/seekBar1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:max="150" />

        <FrameLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
            <ImageView
            android:id="@+id/imageView2"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:src="@drawable/spidometras" />
            <ImageView
            android:id="@+id/imageView1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:src="@drawable/rodykle" />
        </FrameLayout>

如果需要的话：

seekBar = (SeekBar)findViewById(R.id.seekBar1);



    seekBar.setOnSeekBarChangeListener((OnSeekBarChangeListener) this); 
    seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
            // TODO Auto-generated method stub

            ImageView img = (ImageView)findViewById(R.id.imageView1);
            Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.rodykle);
            // Getting width & height of the given image.
            int w = bmp.getWidth();
            int h = bmp.getHeight();
            // Setting post rotate to 90
            Matrix mtx = new Matrix();
            mtx.postRotate(progress);
            // Rotating Bitmap
            Bitmap rotatedBMP = Bitmap.createBitmap(bmp, 0, 0, w, h, mtx, true);
            BitmapDrawable bmd = new BitmapDrawable(rotatedBMP);
            img.setImageDrawable(bmd);  

        }
    });

}

Answer 1

删除seekBar.setOnSeekBarChangeListener((OnSeekBarChangeListener) this);行

仔细查看您的班级代码

下面一行：

 seekBar.setOnSeekBarChangeListener((OnSeekBarChangeListener) this);

尝试将案例活动键入OnSeekBarChangeListener，然后在下一行添加新的OnSeekBarChangeListener。所以只需删除此行。

Answer 2

听起来您生成的文件已损坏/未更新。尝试去Project-＆gt;干净。

两个图像和搜索栏“无法转换为”错误

2 个答案: