seekbar | 易学教程

Why is my Dialog Seekbar crashing? Null Pointer Exception

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问题 I have a seekbar on a dialog and it is crashing. It says there is a NullPointerException . But I can't find it! Where is my mistake? I commented where the NullPointerException is. dialog_context_mark.xml: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/add_hw_dialog" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:padding="10dp" > <RelativeLayout android:layout_width="wrap_content" android

Trouble positioning customized thumb at the centre of seekbar

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问题 I tried to change the width of seekbar and made it thin. But my thumb is not coming at the centre of seekbar. Thumb is a customised 9 patch image. <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/relLayout" android:orientation=

Align tick marks to an Android SeekBar

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问题 I'm attempting to put some tick mark indicators to a SeekBar on Android. I am able to generate a background with the tick marks just fine, however I can't figure out a way to align the tick marks with the actual SeekBar line. As you can see from the screenshot, the tick marks actually start before the SeekBar line does. I could find the distance by trial and error, but I doubt it's going to remain the same on every device. I also noticed the space between the line and the edge of the

How to change seek bar progress colour according to its progress?

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问题 I want to create a custom seekbar, whose progress bar's colour change between red and blue as the user changes the progress of the bar. I have tried it but its only changing the background colour not the progress bar color. seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { public void onStopTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } public void onStartTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } public void onProgressChanged

Correct usage of Android's SeekBar?

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问题 I tried plugging a SeekBar into my video app, but it doesn't seem to ever reach the end of the bar. Here's the code: videoSeekBar = (SeekBar) activity.findViewById(R.id.videoPlayerSeek); videoDuration = player.getDuration(); videoSeekBar.setMax(videoDuration); videoSeekBar.setProgress(0); // Start lengthy operation in a background thread new Thread(new Runnable() { public void run() { while (videoPlayProgress < videoDuration) { videoPlayProgress = player.getCurrentPosition(); // Update the

Getting percentage value from seek bar?

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问题 I have just like this figure, which is get value from this, Here I Used SeekBar,but could not get value where i mention in figure. would you guys help me this problem? So please also provide me information , what is the best solution to get this type of value? Here all are differenet seek bar. First SeekBar have 25% and second seek Baar 50%. If i have scroll seek bar then simultaneously increase or decrease the percentage in box. 回答1: Create a view in xml <LinearLayout android:layout_width=

Android Remove SeekBar Background

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问题 Is there a way I can remove the background bar image in the SeekBar android widget? I just want it to show a slider with no progress bar behind it. Any help? 回答1: There is a simpler way that doesn't require creating a new drawable. Simply set the following in your xml definition android:progressDrawable="@android:color/transparent" Or if you want to do it in your code: mySlider.setProgressDrawable(new ColorDrawable(android.R.color.transparent)); 回答2: Well I solved my own problem. To remove

SeekBar with decimal values

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问题 Do I create a create SeekBar that uses decimal values? For example, it would display 0.0 , 0.1 , 0.2 , 0.3 , ..., 5.5 , 5.6 , 5.7 , ..., 9.9 , 10.0 回答1: A SeekBar defaults to a value between 0 and 100. When the onProgressChanged function is called from the SeekBar's change listener, the progress number is passed in the progress parameter. If you wanted to convert this progress into a decimal from 0.0 -> 10.0 to display or process, all you would need to do is divide the progress by 10 when you

android中如何利用attrs和styles定义控件

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一直有个问题就是，Android中是如何通过布局文件，就能实现控件效果的不同呢？比如在布局文件中，我设置了一个TextView，给它设置了textColor，它就能够改变这个TextView的文本的颜色。这是如何做到的呢？我们分3个部分来看这个问题1.attrs.xml 2.styles.xml 3.看组件的源码。 1.attrs.xml: 我们知道Android的源码中有attrs.xml这个文件，这个文件实际上定义了所有的控件的属性，就是我们在布局文件中设置的各类属性你可以找到attrs.xml这个文件，打开它，全选，右键->Show In->OutLine。可以看到整个文件的解构下面是两个截图：我们大概可以看出里面是Android中的各种属性的声明，比如textStyle这个属性是这样定义的： Java代码  <attr name= "textStyle" > <flag name= "normal" value= "0" /> <flag name= "bold" value= "1" /> <flag name= "italic" value= "2" /> </attr>  <attr name="textStyle"

Seekbar with tooltip android

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问题 Hi All, I am trying to customize android seekbar with tooltip, like the given image. Is there any way to add the textview with the thumb in seekbar. or any other idea Thanks 回答1: We can do it by getting the bounds of thumb. and setting the x of textview in on progressChanged of seekbar @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { mDistance.setText("" + AppConstants.getDistance() + " miles"); //Get the thumb bound and get its left value int x =