Java Textview Gravity 在 android 中无法正常工作
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Textview Gravity not working properly in android
提问by Krish
What's wrong with my code, I'm trying to display my TextView named "invalid", in different locations (left,right,center), but the gravity (left,right,center) won't work! 
我的代码有什么问题，我试图"invalid"在不同的位置（左、右、中心）显示名为 的 TextView ，但重力（左、右、中心）不起作用！
My text.xml is
我的 text.xml 是
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="20dp" >
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/etext"
android:hint="@string/comment"
android:inputType="textPassword"/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="100">
<Button
android:id="@+id/button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/button"
android:layout_weight="25"/>
<ToggleButton
android:id="@+id/toggleButton1"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:text="ToggleButton"
android:layout_weight="75"
android:checked="true"
android:paddingLeft="15dp"/>
</LinearLayout>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/invalid"
android:layout_gravity="center"
android:gravity="center" />
</LinearLayout>
My TextPlay.java is
我的 TextPlay.java 是
public class TextPlay extends Activity {
Button button;
ToggleButton tbutton;
TextView tview;
EditText et;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.text);
button = (Button) findViewById(R.id.button1);
tbutton = (ToggleButton) findViewById(R.id.toggleButton1);
tview = (TextView) findViewById(R.id.textView1);
et = (EditText) findViewById(R.id.etext);
tbutton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (tbutton.isChecked()) {
et.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
} else {
et.setInputType(InputType.TYPE_TEXT_VARIATION_PASSWORD);
}
}
});
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String input = et.getText().toString();
System.out.println(input);
if (input.contentEquals("left")) {
tview.setGravity(Gravity.LEFT);
} else if (input.contentEquals("right")) {
System.out.println("inside right");
tview.setGravity(Gravity.RIGHT);
} else if (input.contentEquals("right")) {
tview.setGravity(Gravity.CENTER);
}
}
});
}
}
采纳答案by Guian
You set this text view a width of "wrap_content" it means, what ever the text is, the view take the size of the text.
您将此文本视图设置为“ wrap_content”的宽度，这意味着无论文本是什么，视图都会采用文本的大小。
and in the LinearLayout, the default gravity (used here) is 'center'
并且在 中LinearLayout，默认重力（此处使用）是“中心”
you should try this :
你应该试试这个：
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent" <= change this
android:layout_height="wrap_content"
android:text="@string/invalid"
android:gravity="center" <= then this gravity will be taken into account
/>
回答by njzk2
99% of the time, not working properly== not used properly.
99% 的情况下，not working properly== not used properly。
You are mistaking gravityand layout_gravity.
你错了gravity和layout_gravity。
gravityis the way the text will align itself in the TextView. The TextViewbeing in wrap_contentthis does nothing, as the TextViewis exactly the size of the text.
gravity是文本在TextView. 将TextView在存在wrap_content这种什么都不做，因为TextView正是文本的大小。
layout_gravityis the way the TextViewwill align itself in its parent, in your case in the vertical LinearLayout
layout_gravity是TextView将自己在其父级中对齐的方式，在您的情况下是垂直的LinearLayout
回答by Pratik Dasa
You have given your TextView width wrap_content, and that is the problem, Check below code and replace it to your code.
您已经给了 TextView 宽度 wrap_content，这就是问题所在，请检查下面的代码并将其替换为您的代码。
<TextView
android:id="@+id/txtInvalid"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/invalid"
android:gravity="center"
/>
回答by Pratik Dasa
set android:layout_width="fill_parent"for textView1
android:layout_width="fill_parent"为 textView1设置
回答by MonoThreaded
Make sure you don't have something like that hanging around
确保你没有这样的东西闲逛
app:layout_box="left|top"
