Android学习笔记: 第四天

12. 常见控件（二）

RadioGroup,  RadioButton 和 Toast

<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="@string/female" />                <RadioButton            android:id="@+id/maleButton"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/male"            /></RadioGroup>

private RadioGroup genderGroup = null;private RadioButton femaleButton = null;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) {if (femaleButton.getId() == checkedId) {System.out.println("female___2");Toast.makeText(Activity07.this, "female___3", Toast.LENGTH_SHORT).show();} else if (maleButton.getId() == checkedId) {System.out.println("maiel ");}}});

CheckBox

    <CheckBox         android:id="@+id/swim"        android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="@string/swim" />        <CheckBox         android:id="@+id/run"        android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="@string/run" />    <CheckBox         android:id="@+id/read"        android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="@string/read" />

private CheckBox swimBox = null;private CheckBox runBox = null;private CheckBox readBox = null;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) {if (isChecked) {System.out.println("swim is checked ");} else {System.out.println("swim is not checked ");}}});runBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {if (isChecked) {System.out.println("run is checked ");} else {System.out.println("run is not checked ");}}});readBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {if (isChecked) {System.out.println("read is checked ");} else {System.out.println("read is not checked ");}}});

13. 常见控件（三）

ProgressBar

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/hello" />        <ProgressBar         android:id="@+id/firstBar"        style="?android:attr/progressBarStyleHorizontal"        android:layout_width="200dp"        android:layout_height="wrap_content"        android:visibility="gone"        />        <ProgressBar         android:id="@+id/secondBar"        style="?android:attr/progressBarStyle"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:visibility="gone"        />        <Button        android:id="@+id/myButton"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="begin"        /></LinearLayout>

public class ProgressBarTestActivity extends Activity {int i=0;private ProgressBar firstBar = null;private ProgressBar secondBar = null;private Button myButton = null;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                firstBar = (ProgressBar) findViewById(R.id.firstBar);        secondBar = (ProgressBar) findViewById(R.id.secondBar);        myButton = (Button) findViewById(R.id.myButton);                myButton.setOnClickListener(new ButtonListener());    }        class ButtonListener implements OnClickListener{@Overridepublic void onClick(View v) {if (i == 0) {firstBar.setVisibility(View.VISIBLE);firstBar.setMax(150);secondBar.setVisibility(View.VISIBLE);} else if (i < firstBar.getMax()) {firstBar.setProgress(i);firstBar.setSecondaryProgress(i + 10);secondBar.setProgress(i);} else {firstBar.setVisibility(View.GONE);secondBar.setVisibility(View.GONE);}i = i+10;}        }}

ListView

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >        <LinearLayout         android:id="@+id/listLinearLayout"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:orientation="vertical">                <ListView             android:id="@id/android:list"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:drawSelectorOnTop="false"            android:scrollbars="vertical" />    </LinearLayout>    </LinearLayout>

user.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="horizontal"    android:paddingBottom="1dip"    android:paddingLeft="10dip"    android:paddingRight="10dip"    android:paddingTop="1dip" >    <TextView        android:id="@+id/user_name"        android:layout_width="180dip"        android:layout_height="30dip"        android:singleLine="true"        android:textSize="10pt" />    <TextView        android:id="@+id/user_ip"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:gravity="right"        android:textSize="10pt" /></LinearLayout>

package mars.myListView;import java.util.ArrayList;import java.util.HashMap;import android.app.Activity;import android.app.ListActivity;import android.os.Bundle;import android.view.View;import android.widget.ListView;import android.widget.SimpleAdapter;public class MyListView extends ListActivity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                ArrayList<HashMap<String,String>> list = new ArrayList<HashMap<String,String>>();        HashMap<String,String> map1 = new HashMap<String, String>();        HashMap<String,String> map2 = new HashMap<String, String>();        HashMap<String,String> map3 = new HashMap<String, String>();        map1.put("user_name", "zhangsan");        map1.put("user_ip", "192.168.0.1");        map2.put("user_name", "lisi");        map2.put("user_ip", "192.168.0.2");        map3.put("user_name", "wangwu");        map3.put("user_ip", "192.168.0.3");        list.add(map1);        list.add(map2);        list.add(map3);        SimpleAdapter listAdapter = new SimpleAdapter(this, list, R.layout.user, new String[]{"user_name", "user_ip"}, new int[]{R.id.user_name, R.id.user_ip});        setListAdapter(listAdapter);    }@Overrideprotected void onListItemClick(ListView l, View v, int position, long id) {// TODO Auto-generated method stubsuper.onListItemClick(l, v, position, id);System.out.println("id----------" + id);System.out.println("position----" + position);}}

14. Handler的使用（一）

public class HandlerTestActivity extends Activity {private Button startButton = null;private Button endButton = null;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);startButton = (Button) findViewById(R.id.startButton);startButton.setOnClickListener(new StartButtonListener());endButton = (Button) findViewById(R.id.endButton);endButton.setOnClickListener(new EndButtonListener());}class StartButtonListener implements OnClickListener {@Overridepublic void onClick(View arg0) {handler.post(updateThread);}}class EndButtonListener implements OnClickListener {@Overridepublic void onClick(View v) {handler.removeCallbacks(updateThread);}}Handler handler = new Handler();Runnable updateThread = new Runnable() {@Overridepublic void run() {System.out.println("UpdateThread");handler.postDelayed(updateThread, 3000);}};}

15. Handler的使用（二）

Handler和Listenr与Activity在同一线程里，用了Looper机制

HandlerThread用于创建一个新线程，新线程中也使用Looper机制

msg.arg1和msg.arg2用于传递简单整数

msg.bundle用于进程内传递多个任意类型数据

msg.object用于在进程间传递无类型数据

16. SQLite使用方法

SQLiteOpenHelper

adb 访问SQLite

ContentValues

Cursor

17. debug

Log.w("myTag","my log .... ");

Log.d("myTag","my log .... ");

Log.i("myTag","my log .... ");

Log.e("myTag","my log .... ");

Log.v("myTag","my log .... ");