Android开发初学笔记(一) 基本控件的使用

从零开始学Android，看了一天的视频的收获，了解了一些基本布局和一些基本控件的使用。

TextView

EditText

Button

RadioButton

CheckBox

了解了Activity生命周期的一些基本概念。

onCreate()

onStart()

onRestart()

onResume()

onPause()

onStop()

onDestroy()

代码根据视频纯手敲，通过测试，记录下来！

MainActivity.java

package com.example.helloworld;import android.net.Uri;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.EditText;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {private Button myButton=null;private TextView myTextView=null;private EditText factorOne=null;private EditText factorTwo=null;private RadioGroup genderGroup=null;private RadioButton femaleButton=null;private RadioButton maleButton=null;private CheckBox swimBox = null;private CheckBox runBox = null;private CheckBox readBox = null;private Button sendMsgButton = null;    @Override    protected void onCreate(Bundle savedInstanceState) {    System.out.println("MainActivity------->onCreate");        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        factorOne = (EditText)findViewById(R.id.factorOne);        factorTwo = (EditText)findViewById(R.id.factorTwo);        myTextView = (TextView)findViewById(R.id.myTextID);        myButton = (Button)findViewById(R.id.myButtonID);        myTextView.setText(R.string.textView);        myButton.setText("等于");                myButton.setOnClickListener( new MyButtonListener());                        genderGroup = (RadioGroup)findViewById(R.id.genderGroup);        femaleButton = (RadioButton)findViewById(R.id.femaleButton);        maleButton = (RadioButton)findViewById(R.id.maleButton);        genderGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(RadioGroup group, int checkedId) {// TODO Auto-generated method stubif(femaleButton.getId() == checkedId){System.out.println("female");Toast.makeText(MainActivity.this, "female~~~", Toast.LENGTH_SHORT).show();}else if(maleButton.getId() == checkedId){System.out.println("male");Toast.makeText(MainActivity.this, "male~~~", Toast.LENGTH_SHORT).show();}}});                swimBox = (CheckBox)findViewById(R.id.swim);        runBox = (CheckBox)findViewById(R.id.run);        readBox = (CheckBox)findViewById(R.id.read);        swimBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {// TODO Auto-generated method stubif(isChecked){System.out.println("swim is checded");}else{System.out.println("swim is unchecded");}}});        runBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {// TODO Auto-generated method stubif(isChecked){System.out.println("run is checded");}else{System.out.println("run is unchecded");}}});        readBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {// TODO Auto-generated method stubif(isChecked){System.out.println("read is checded");}else{System.out.println("read is unchecded");}}});                        sendMsgButton = (Button)findViewById(R.id.sendMsgButtonID);        sendMsgButton.setOnClickListener(new sendMsgButtonListener());    }    //当客户点击NENU按钮的时候，调用该方法    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        menu.add(0,1,1,"退出");        menu.add(0,2,2,"关于");    //getMenuInflater().inflate(R.menu.main, menu);        return true;    }        //当客户点击菜单当中的某一个选项时，会调用该方法    @Overridepublic boolean onOptionsItemSelected(MenuItem item) {// TODO Auto-generated method stub    if(item.getItemId() == 1)    {    finish();    }return super.onOptionsItemSelected(item);}class MyButtonListener implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stubString factorOneStr = factorOne.getText().toString();String factorTwoStr = factorTwo.getText().toString();//生成一个Intent对象；Intent intent = new Intent();intent.putExtra("one", factorOneStr);intent.putExtra("two", factorTwoStr);intent.setClass(MainActivity.this, OtherActivity.class);MainActivity.this.startActivity(intent);}        }//调用发送短信的界面class sendMsgButtonListener implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stubUri uri = Uri.parse("smsto:13500001111");Intent intent = new Intent(Intent.ACTION_SENDTO, uri);intent.putExtra("sms_body", "The SMS text");startActivity(intent);}        }@Overrideprotected void onDestroy() {// TODO Auto-generated method stubSystem.out.println("MainActivity------->onDestroy");super.onDestroy();}@Overrideprotected void onPause() {// TODO Auto-generated method stubSystem.out.println("MainActivity------->onPause");super.onPause();}@Overrideprotected void onRestart() {// TODO Auto-generated method stubSystem.out.println("MainActivity------->onRestart");super.onRestart();}@Overrideprotected void onResume() {// TODO Auto-generated method stubSystem.out.println("MainActivity------->onResume");super.onResume();}@Overrideprotected void onStart() {// TODO Auto-generated method stubSystem.out.println("MainActivity------->onStart");super.onStart();}@Overrideprotected void onStop() {// TODO Auto-generated method stubSystem.out.println("MainActivity------->onStop");super.onStop();}}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    >    <EditText         android:id="@+id/factorOne"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        />        <TextView        android:id="@+id/myTextID"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        />        <EditText        android:id="@+id/factorTwo"       android:layout_width="fill_parent"       android:layout_height="wrap_content"       />    <Button        android:id="@+id/myButtonID"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_marginTop="15dp"         />    <RadioGroup         android:id="@+id/genderGroup"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="vertical"        >        <RadioButton         android:id="@+id/femaleButton"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="女"        />        <RadioButton         android:id="@+id/maleButton"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="男"        />            </RadioGroup>    <CheckBox        android:id="@+id/swim"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="swim"        />    <CheckBox        android:id="@+id/run"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="run"        />    <CheckBox        android:id="@+id/read"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="read"        />        <Button        android:id="@+id/sendMsgButtonID"        android:layout_width="fill_parent"        android:layout_height="wrap_content"android:text="send Message"        /></LinearLayout>

OtherActivity.java

package com.example.helloworld;import android.os.Bundle;import android.widget.TextView;import android.app.Activity;import android.content.Intent;public class OtherActivity extends Activity{private TextView myOtherTextView = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubSystem.out.println("OtherActivity------->onCreate");super.onCreate(savedInstanceState);setContentView(R.layout.other);Intent intent = getIntent();String factorOneStr = intent.getStringExtra("one");String factorTwoStr = intent.getStringExtra("two");//JAVA中String转int的方法int factorOneInt = Integer.parseInt(factorOneStr);int factorTwoInt = Integer.parseInt(factorTwoStr);int value = factorOneInt * factorTwoInt;myOtherTextView = (TextView)findViewById(R.id.myOtherTextID);myOtherTextView.setText(value + "");//myOtherTextView.setText(R.string.other);}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubSystem.out.println("OtherActivity------->onDestroy");super.onDestroy();}@Overrideprotected void onPause() {// TODO Auto-generated method stubSystem.out.println("OtherActivity------->onPause");super.onPause();}@Overrideprotected void onRestart() {// TODO Auto-generated method stubSystem.out.println("OtherActivity------->onRestart");super.onRestart();}@Overrideprotected void onResume() {// TODO Auto-generated method stubSystem.out.println("OtherActivity------->onResume");super.onResume();}@Overrideprotected void onStart() {// TODO Auto-generated method stubSystem.out.println("OtherActivity------->onStart");super.onStart();}@Overrideprotected void onStop() {// TODO Auto-generated method stubSystem.out.println("OtherActivity------->onStop");super.onStop();}}

other.xml

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TextView        android:id="@+id/myOtherTextID"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        /></RelativeLayout>