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imageView概述

https://img1.sycdn.imooc.com//5ba0be880001f5b712800720.jpg

第2步：XML文件與源碼關(guān)聯(lián)? src-> Main_activity.java

SetContentView 將布局XML文件引入到activity當(dāng)中

第3步：布置，模擬器看效果? demo1(項(xiàng)目名)-> Run As -> android application

第1步：界面? res->layout->Main_activity.xml

textView一個(gè)屬性

Wrap_content ?包裹實(shí)際文本內(nèi)容

Match_parent ?當(dāng)前控件鋪滿父類容器

Fill_parent? 當(dāng)前控件鋪滿父類容器

EditText控件的常用屬性

TextView控件的常用屬性

Android項(xiàng)目結(jié)構(gòu)介紹

開(kāi)發(fā)環(huán)境工具

RadioGroup

<RadioGroup
??????? android:id="@+id/radioGroup1"
??????? android:orientation="vertical"
??????? android:layout_width="wrap_content"
??????? android:layout_height="wrap_content"
??????? android:layout_alignParentLeft="true"
??????? android:layout_alignParentTop="true" >

??????? <RadioButton
??????????? android:id="@+id/radio0"
??????????? android:layout_width="wrap_content"
??????????? android:layout_height="wrap_content"
??????????? android:checked="true"
??????????? android:text="man" />

??????? <RadioButton
??????????? android:id="@+id/radio1"
??????????? android:layout_width="wrap_content"
??????????? android:layout_height="wrap_content"
??????????? android:text="women" />
??? </RadioGroup>

package com.example.demo3;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends Activity implements android.widget.RadioGroup.OnCheckedChangeListener{
?? ?
?? ?private RadioGroup? ra;

?? ?@Override
?? ?protected void onCreate(Bundle savedInstanceState) {
?? ??? ?super.onCreate(savedInstanceState);
?? ??? ?setContentView(R.layout.activity_main);
?? ??? ?
?? ??? ?ra=(RadioGroup) findViewById(R.id.radioGroup1);
?? ??? ?ra.setOnCheckedChangeListener(this);
?? ??? ?
?? ?}

?? ?@Override
?? ?public void onCheckedChanged(RadioGroup group, int checkedId) {
?? ??? ?// TODO 自動(dòng)生成的方法存根
?? ??? ?switch (checkedId) {
?? ??? ?case R.id.radio0:
?? ??? ??? ?Toast.makeText(this, "you are man",Toast.LENGTH_SHORT).show();
?? ??? ??? ?break;

?? ??? ?default:
?? ??? ??? ?Toast.makeText(this, "you are women",Toast.LENGTH_SHORT).show();
?? ??? ??? ?break;
?? ??? ?}
?? ?}
}

<CheckBox
??????? android:id="@+id/checkBox1"
??????? android:layout_width="wrap_content"
??????? android:layout_height="wrap_content"
??????? android:text="籃球" />

?<ToggleButton
??????? android:id="@+id/toggleButton1"
??????? android:layout_width="match_parent"
??????? android:layout_height="wrap_content"
??????? android:textOn="開(kāi)"
??????? android:textOff="關(guān)"
????????? />

??? <ImageView
??????? android:id="@+id/imageView1"
??????? android:layout_width="match_parent"
??????? android:layout_height="match_parent"
??????? android:background="@drawable/off" />

private ToggleButton tb;
?? ?private ImageView im;
?? ?@Override
?? ?protected void onCreate(Bundle savedInstanceState) {
?? ??? ?super.onCreate(savedInstanceState);
?? ??? ?setContentView(R.layout.activity_main);
?? ??? ?tb=(ToggleButton) findViewById(R.id.toggleButton1);
?? ??? ?im=(ImageView) findViewById(R.id.imageView1);
?? ??? ?
?? ??? ?tb.setOnCheckedChangeListener(this);
?? ??? ?
?? ?}
?? ?@Override
?? ?public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
?? ??? ?// TODO 自動(dòng)生成的方法存根
?? ??? ?
?? ??? ?im.setBackgroundResource(isChecked?);
?? ?}?? ?

activity的生命周期

匿名內(nèi)部類監(jiān)聽(tīng)按鈕點(diǎn)擊事件

Button 和 ImageButton特征