Relative布局简介
相对布局的组件是由兄弟组件和父组价决定的,因此这种布局被称为相对布局。
属性设置介绍
RelativeLayout.Layoutparam中只能设置为true和false的属性是:
需要依赖其他组件Id设置的属性:
除此之外,RelativeLayout还可以使用viewGroup.MarginLayoutparams的属性。
梅花布局的实例
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity" android:orientation="vertical"> <RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/ic_launcher" android:id="@+id/view01" android:layout_centerInParent="true"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/ic_launcher" android:layout_below="@id/view01" android:layout_alignLeft="@id/view01"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/ic_launcher" android:layout_above="@id/view01" android:layout_alignLeft="@id/view01"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/ic_launcher" android:layout_toLeftOf="@id/view01" android:layout_alignTop="@id/view01"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/ic_launcher" android:layout_toRightOf="@id/view01" android:layout_alignTop="@id/view01"/> </RelativeLayout></LinearLayout>
表格布局
GridLayout是4.0以后才加入的布局,把这个空间分成rows*columns个格子,一个组件可以设置横跨多少列和多少行。
gridLayout的属性
常用属性:
GridLayout.Layoutparam的属性:
计算器界面的实例
package peng.liu.testview;import android.annotation.TargetApi;import android.app.Activity;import android.os.Build;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.Gravity;import android.widget.Button;import android.widget.GridLayout;import android.widget.TextView;import java.util.Timer;import java.util.TimerTask;public class MainActivity extends Activity { GridLayout grid = null; String[] chars = new String[]{ "7","8","9","/", "4","5","6","*", "1","2","3","-", ".","0","+","+" }; @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); grid = (GridLayout) findViewById(R.id.root); for (int i=0;i<chars.length;i++){ Button button = new Button(this); button.setText(chars[i]); button.setTextSize(40); GridLayout.Spec rowSpec = GridLayout.spec(i / 4 + 2); GridLayout.Spec columnSpec = GridLayout.spec(i%4); GridLayout.LayoutParams params = new GridLayout.LayoutParams(rowSpec,columnSpec); params.setGravity(Gravity.FILL); grid.addView(button,params); } }}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity" android:orientation="vertical"> <GridLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/root" android:rowCount="6" android:columnCount="4"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_columnSpan="4" android:layout_marginLeft="4px" android:layout_marginRight="4px" android:padding="5px" android:textSize="50sp" android:layout_gravity="right" android:background="#eee" android:textColor="#000" android:text="0" /> </GridLayout></LinearLayout>
效果图
绝对布局
因为绝对布局,需要亲自设置组件的x位置,和y位置,所以一定程度上已经过时了。
属性
android:layout_x:设置组件的z坐标
android:layout_y:设置组件的Y坐标
可以这么说相对布局已经过时了~