原文提問在:http://ask.csdn.net/questions/22049#answer_5984
用XML布局,能夠將TextView控制項置中,而代碼布局不能將TextView控制項置中。
經測試,代碼布局中,addView函數對LayoutParams參數添加進的gravity和leftMargin等屬性未進行應有的操作,但能夠對寬高的設定進行對應的操作。
在NEXUS 4(android 4.3)和我自己的手機(android 4.1.2)上測試,都存在這樣的問題。
百度和Google都未找到我想要的答案或類似情況。
如果需要LinearLayout裡面的控制項全部置中的話,將LinearLayout的gravity設定為Gravity.CENTER即可,但我希望一些控制項靠左對齊,一些置中。
希望得到大家的協助,謝謝!
XML布局檔案代碼:
<?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" ><Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="Button" /><TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="TextView" /></LinearLayout>
java檔案布局代碼:
protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); //setContentView(R.layout.layout); LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); LinearLayout mainLayout = new LinearLayout(this); mainLayout.setOrientation(LinearLayout.VERTICAL); setContentView(mainLayout, lp); lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); lp.gravity = Gravity.CENTER; Button button = new Button(this); button.setText("Button"); mainLayout.addView(button, lp); lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); lp.gravity = Gravity.CENTER; TextView textView = new TextView(this); textView.setText("TextView"); mainLayout.addView(textView, lp);}
解決方案:
經測試,是代碼的問題,使用下面的代碼,可以達到所需效果:
package com.shq.layouttest;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.view.Gravity;import android.view.Menu;import android.view.ViewGroup;import android.widget.Button;import android.widget.LinearLayout;import android.widget.TextView;public class MainActivity extends Activity{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //setContentView(R.layout.layout); ViewGroup.LayoutParams lp_ViewGroup = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); LinearLayout mainLayout = new LinearLayout(this); mainLayout.setOrientation(LinearLayout.VERTICAL); setContentView(mainLayout, lp_ViewGroup); LinearLayout.LayoutParams lp_LinearLayout = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); Button button = new Button(this); button.setText("Button"); mainLayout.addView(button, lp_LinearLayout); lp_LinearLayout = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); lp_LinearLayout.gravity = Gravity.CENTER; TextView textView = new TextView(this); textView.setText("TextView"); mainLayout.addView(textView, lp_LinearLayout); }}
不直接使用LayoutParams,而使用對應的LinearLayout.LayoutParams等。