在TextView的onTextChanged设置文本 [英] Set text on TextView onTextChanged

问题描述

我定义为类的属性，这样我可以在整个类访问一个文本视图。在onCreate方法我做到以下几点：

I have a text view defined as class attribute so that I can access it in the entire class. In onCreate method I do the following:

chars = (TextView) findViewById(R.id.chars);
chars.setText("300");

后来......

Later...:

public void onTextChanged(CharSequence s, int start, int before,
        int count) {

    int max = Integer.parseInt((String)chars.getText());
    int current = (message.getText().toString()).length();

    chars.setText(max-current);
}

嗯，其实我只是取回300作为字符串，将其转换为整数格式，计算我想设置这个值作为文本视图文本max和当前文本length.Then之间的差异。但这种失败

Well, actually I just retrieve the 300 as string, convert it to integer format and calculate the difference between max and current text length.Then I want to set this value as text on the text view. But this fails

12-29 20:37:06.155: E/AndroidRuntime(2165): FATAL EXCEPTION: main
12-29 20:37:06.155: E/AndroidRuntime(2165): android.content.res.Resources$NotFoundException: String resource ID #0x12b
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.content.res.Resources.getText(Resources.java:201)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.widget.TextView.setText(TextView.java:2857)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at com.markupartist.android.actionbar.example.ComposeActivity$3.onTextChanged(ComposeActivity.java:86)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.widget.TextView.sendOnTextChanged(TextView.java:6295)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.widget.TextView.handleTextChanged(TextView.java:6336)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:6485)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.text.SpannableStringBuilder.sendTextChange(SpannableStringBuilder.java:889)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:352)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:269)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:432)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:409)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:28)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:654)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.view.inputmethod.BaseInputConnection.setComposingText(BaseInputConnection.java:415)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:318)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:75)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.os.Looper.loop(Looper.java:123)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at android.app.ActivityThread.main(ActivityThread.java:3683)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at java.lang.reflect.Method.invokeNative(Native Method)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at java.lang.reflect.Method.invoke(Method.java:507)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-29 20:37:06.155: E/AndroidRuntime(2165):     at dalvik.system.NativeStart.main(Native Method)

任何想法什么错？

Any ideas whats wrong?

推荐答案

在这里会发生什么事是你正在尝试设置整数值实际上是作为一个资源ID。所以 chars.setText（将String.valueOf（最大电流））; 应该修复它。

What happens here is that the integer value which you are trying to set is actually taken as a resource id. so chars.setText(String.valueOf(max-current)); should fix it..

编辑：
另外要注意的。当您尝试的setText上的字符 的TextView 从里面的 onTextChanged 它会再次触发 onTextChanged ，这可能在一个永无止境的循环结束。

On another note. When you try to setText on the chars TextView from inside the onTextChanged it will again trigger a onTextChanged and this might end in a never ending loop.

这篇关于在TextView的onTextChanged设置文本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！