Android - 如何隐藏/显示进度条 onclick
我试图在单击按钮时显示进度条.当我测试应用程序时，它会强制关闭/停止.在添加进度条代码之前，我的应用程序运行良好.
I am trying to show a progressbar when a button is clicked. When i test the app it force closes / stops. My app works fine before the progressbar code is added in.
如果这很重要，我也使用切换按钮，我希望旋转进度条不是对话框.
also i am using a toggle button if that can matters, and i want the spinning progressbar not a dialog.
有什么帮助吗?
这是我的代码:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button = (Button) findViewById(R.id.buttonFlashlight);
Context context = this;
PackageManager pm = context.getPackageManager();
if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
Log.e("err", "Device has no camera!");
return;
}
camera = Camera.open();
final Parameters p = camera.getParameters();
button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
if (isLighOn) {
progressBar1.setVisibility(View.INVISIBLE);
final MediaPlayer mp1=MediaPlayer.create(getBaseContext(), R.drawable.click);
mp1.start();
Log.i("info", "torch is turn off!");
p.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(p);
camera.stopPreview();
isLighOn = false;
WindowManager.LayoutParams params = getWindow().getAttributes();
params.screenBrightness = 1.0f;
getWindow().setAttributes(params);
} else {
progressBar1.setVisibility(View.VISIBLE);
final MediaPlayer mp1=MediaPlayer.create(getBaseContext(), R.drawable.click);
mp1.start();
Log.i("info", "torch is turn on!");
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(p);
camera.startPreview();
isLighOn = true;
WindowManager.LayoutParams params = getWindow().getAttributes();
params.screenBrightness = 0.05f;
getWindow().setAttributes(params);
}
}
});
}
推荐答案
试试下面的代码...
handler1 = new Handler()
{
@Override
public void handleMessage(Message msg)
{
switch(msg.what)
{
case 1:
static_class.digi_pd = ProgressDialog.show(Create_Digitizing_Job.this, "Loading...", "Please Wait..", true,false);
static_class.digi_pd.setCancelable(false);
break;
case 2:
static_class.digi_pd.dismiss();
break;
}
}
};
thread1 = new Thread()
{
@Override
public void run()
{
try
{
handler1.sendEmptyMessage(1);
// write your code here....
handler1.sendEmptyMessage(3);
handler1.sendEmptyMessage(2);
}
catch (Exception e)
{
Log.w("thread error...",""+e);
//e.printStackTrace();
}
}
};
thread1.start();
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