安卓开发学习之003 LinearLayout之baseLine详解
16lz
2021-01-23
本文主要介绍LinearLayout中的两个属性
android:baselineAligned 和android:baselineAlignedChildIndex
1.android:baselineAligned
1.这个baseline指的是这个UI控件的baseline–文字距UI控件顶部的偏移量
2.只有带文本内容的控件才有基线，如TextView/Button/EditText
3.LinearLayout控件默认android:baselineAligned为true，如果
LinearLayout的orientation为horizontal的话，子控件默认是文字对齐的
2.android:baselineAlignedChildIndex
设置当前LinearLayout与其它View的对齐方式.
索引号从0开始,表示是以当前LinearLayout下第m+1控件为基准线与其它View对齐
3.效果图
4.布局文件
res/layout/fragment_base_line.xml
<?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"> <LinearLayout android:id="@+id/ll_parent" android:layout_width="match_parent" android:layout_height="200dp" android:baselineAligned="true" android:baselineAlignedChildIndex="3" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="60dp" android:layout_marginRight="3dip" android:gravity="center" android:text="String1"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="3dip" android:text="Button1"/> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:baselineAlignedChildIndex="1" android:orientation="vertical"> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@android:drawable/arrow_up_float"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="5dip" android:text="String2"/> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@android:drawable/arrow_down_float"/> </LinearLayout> <LinearLayout android:id="@+id/ll_child" android:layout_width="wrap_content" android:layout_height="wrap_content" android:baselineAlignedChildIndex="0" android:orientation="vertical"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="5dip" android:text="String3"/> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@android:drawable/arrow_up_float"/> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@android:drawable/arrow_down_float"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="5dip" android:text="String4"/> </LinearLayout> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="String5" android:textSize="30dp" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="20dp"> <ToggleButton android:id="@+id/toggleButton1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textOn="baselineAligned_true" android:textOff="baselineAligned_false" android:checked="true" android:onClick="click"/> <ToggleButton android:id="@+id/toggleButton2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="20dp" android:textOn="Baseline_String4" android:textOff="Baseline_String3" android:checked="true" android:onClick="click"/> </LinearLayout></LinearLayout>5.java文件
src/BaseLineActivity.java
package com.antex.baseLine;import android.content.Intent;import android.os.Bundle;import android.support.design.widget.FloatingActionButton;import android.support.design.widget.Snackbar;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.LinearLayout;import android.widget.ToggleButton;public class BaseLineActivity extends AppCompatActivity { private static final String TOGGLEBUTTON1_ISCHECKED="TOGGLEBUTTON1_ISCHECKED"; private static final String TOGGLEBUTTON2_ISCHECKED="TOGGLEBUTTON2_ISCHECKED"; private LinearLayout linearLayout1, linearLayout2; private ToggleButton toggleButton1, toggleButton2; @Override protected void onCreate(Bundle savedInstanceState) { System.out.println("BaseLineActivity.onCreate"); super.onCreate(savedInstanceState); setContentView(R.layout.activity_base_line); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) .setAction("Action", null).show(); } }); linearLayout1 = (LinearLayout) findViewById(R.id.ll_parent); linearLayout2 = (LinearLayout) findViewById(R.id.ll_child); toggleButton1 = (ToggleButton) findViewById(R.id.toggleButton1); toggleButton2 = (ToggleButton) findViewById(R.id.toggleButton2); //获取intent Intent intent= getIntent(); //获取保存的ToggleButton状态 if(intent !=null) { boolean b1=intent.getBooleanExtra(TOGGLEBUTTON1_ISCHECKED, true); boolean b2=intent.getBooleanExtra(TOGGLEBUTTON2_ISCHECKED, true); toggleButton1.setChecked(b1); toggleButton2.setChecked(b2); //setBaselineAligned(boolean) 是否允许用户调整它内容的基线。 true 允许按基线对齐,false不对齐 //只有带文本内容的控件才有基线，如TextView/Button/EditText linearLayout1.setBaselineAligned(b1); //setBaselineAlignedChildIndex(m) ,设置当前LinearLayout与其它View的对齐方式. //索引号从0开始,表示是以第m+1控件为基准线与其它View对齐 linearLayout2.setBaselineAlignedChildIndex(b2 ? 3 : 0); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_base_line, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } public void click(View v) { //直接修改不起作用 //linearLayout1.setBaselineAligned(toggleButton1.isChecked()); //linearLayout2.setBaselineAlignedChildIndex(toggleButton2.isChecked() ? 3 : 0); //重启应用,并传入修改后的状态值 Intent intent= new Intent(BaseLineActivity.this,BaseLineActivity.class); intent.putExtra(TOGGLEBUTTON1_ISCHECKED, toggleButton1.isChecked()); intent.putExtra(TOGGLEBUTTON2_ISCHECKED, toggleButton2.isChecked()); startActivity(intent); finish(); }}开发工具：Android Studio1.4
SDK: Android 6.0
API 23
代码下载：BaseLine.zip
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