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我正在使用 seekBar 对自定义相机应用程序进行缩放控制。我的应用程序有时会删除 cameraPreview 并在重新添加 cameraPreview 时我想重置我的搜索栏的进度。 

public void restartCam() {

        //zoomCtrl.setVerticalScrollbarPosition(0x00000000);
        camPreview = new CamSurfaceView(this.getApplicationContext(), camFace);
        frame.addView(camPreview);
        zoomCtrl.setProgress(0);
    }

但我得到一个空指针：

12-03 12:18:54.319: E/AndroidRuntime(15805): FATAL EXCEPTION: main
12-03 12:18:54.319: E/AndroidRuntime(15805): java.lang.NullPointerException
12-03 12:18:54.319: E/AndroidRuntime(15805):    at com.sapientnitro.lcinstore2.view.CamSurfaceView.zoomTo(CamSurfaceView.java:120)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at com.sapientnitro.lcinstore2.activities.CustomCamera.onProgressChanged(CustomCamera.java:643)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at android.widget.SeekBar.onProgressRefresh(SeekBar.java:89)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at android.widget.ProgressBar.doRefreshProgress(ProgressBar.java:609)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at android.widget.ProgressBar.refreshProgress(ProgressBar.java:621)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at android.widget.ProgressBar.setProgress(ProgressBar.java:670)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at android.widget.ProgressBar.setProgress(ProgressBar.java:651)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at com.sapientnitro.lcinstore2.activities.CustomCamera.restartCam(CustomCamera.java:568)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at com.sapientnitro.lcinstore2.activities.CustomCamera.cameraOn(CustomCamera.java:435)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at com.sapientnitro.lcinstore2.activities.CustomCamera$5.onClick(CustomCamera.java:317)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at android.view.View.performClick(View.java:3558)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at android.view.View$PerformClick.run(View.java:14157)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at android.os.Handler.handleCallback(Handler.java:605)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at android.os.Handler.dispatchMessage(Handler.java:92)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at android.os.Looper.loop(Looper.java:137)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at android.app.ActivityThread.main(ActivityThread.java:4514)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at java.lang.reflect.Method.invokeNative(Native Method)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at java.lang.reflect.Method.invoke(Method.java:511)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
12-03 12:18:54.319: E/AndroidRuntime(15805):    at dalvik.system.NativeStart.main(Native Method)

我的进度变化：

@Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

        // TODO Auto-generated method stub
        if (mode.equals("camera")) {
            camPreview.zoomTo(progress);
        }

    }
4

1 回答 1

0 
   Please, try this.

    if (zoomCtrl!= null) {
        zoomCtrl.setProgress(0);
    }
于 2015-01-05T07:34:39.017 回答