Android學(xué)習(xí)（Mars Android）——S01_E06--常見控件的使用方法（計算器）

以下程序有錯誤绅作，閃退先mark下对湃，回頭改

————————Activity03————————

package com.example.activity03;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

//1温治、在Activity03中什聲明四個控件：2個EditText（數(shù)字輸入框）扯罐，1個TextView（乘以）陆赋，1個Button（計算）。-->修改activity03_layout鸠信。xml文件
//2优烧、要為其中的兩個控件（1個TextView（乘以）主经、1個Button（計算））設(shè)置顯示的值
//3杉编、創(chuàng)建一個監(jiān)聽器類，用來監(jiān)聽按鈕按下的動作
//4蛙卤、將監(jiān)聽器類的對象綁定在按鈕對象上

public class Activity03 extends Activity {
//1）在cativity03_layout.xml中聲明好了四個控件過后，
//2）在Activity中將這四個控件取出來：-->聲明代表這四個控件的對象-->用findViewById()方法取出控件
private EditText factorone;
private EditText factortwo;
private TextView symbol;
private Button calculate;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity03_layout);
//3)根據(jù)控件的ID來取得代表控件的對象-->findViewById（R.id.**）
factorone=(EditText)findViewById(R.id.factorone);
factortwo=(EditText)findViewById(R.id.factortwo);
symbol=(TextView)findViewById(R.id.symbol);
calculate=(Button)findViewById(R.id.calculate);
//4)為symbol和calculate設(shè)置顯示的值
//方法一：直接寫入字符串“乘以”/“計算”寥茫。有點：簡單方便挠进；缺點：考慮到范圍可能會有多種語言，直接賦值的方式辕坝，修改起來非常麻煩
//symbol.setText("乘以");
//calculate.setText("計算");
// 方法二：1）在string中配置字符串窍奋，然后由Activity03調(diào)用----推薦！
//（）內(nèi)不再是字符串酱畅，而是對應(yīng)的Id.優(yōu)點：應(yīng)用程序中并無相應(yīng)的值琳袄，只有其Id，真正的值在strings.xml中纺酸，如需修改窖逗，只需要在strings.xml中修改
symbol.setText(R.string.symbol);
calculate.setText(R.string.calculate);
//11)將監(jiān)聽器對象綁定到按鈕(calculate)對象上面去
calculate.setOnClickListener(new CalculateListener());

//20)添加Menu菜單，回調(diào)函數(shù)餐蔬，當(dāng)在手機上電極Menu按鈕時就會執(zhí)行該函數(shù)---Menu于前面EditText碎紊，Button等相比，不需要在布局文件中進(jìn)行配置樊诺，直接復(fù)寫onCreatextMenuClosed（方法）即可
//該方法的作用是仗考，當(dāng)客戶點擊Menu按鈕時候，就會調(diào)用該方法
@Override
public void onContextMenuClosed(Menu menu) {
menu.add(0, 1, 1, R.string.exit);
menu.add(0,2,2,R.string.about);
// TODO Auto-generated method stub
//return super.onContextMenuClosed(menu);
super.onContextMenuClosed(menu);
}
//21)給退出/關(guān)于添加動作--->當(dāng)點擊Item時就會有動作词爬，并把點擊的值傳進(jìn)（item）去
//當(dāng)客戶點擊菜單中的某一個選項時秃嗜，會調(diào)用該方法，并把點擊的選項最為參數(shù)傳進(jìn)去
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId()==1);
finish();
// TODO Auto-generated method stub
return super.onOptionsItemSelected(item);
}

//5)編寫應(yīng)用程序的監(jiān)聽器(內(nèi)部類顿膨，比較常見的锅锨，eg：在多線程程序中使用內(nèi)部類來隱藏run函數(shù)；在編寫模板回調(diào)模式時使用匿名內(nèi)部類作為回調(diào)接口的實現(xiàn))
//1恋沃、在內(nèi)部類中橡类，可以直接使用外部類的成員變量，但不能擁有芽唇；2顾画、可以再內(nèi)部類中使用外部類的成員函數(shù)/對象
//如果對Listener不太了解，可以Google“Observer設(shè)計模式”-->有助于了解Listener
class CalculateListener implements OnClickListener{

@Override
    public void onClick(View v) {

//6)取得兩個EditText控件的值
String factoroneStr = factorone.getText().toString();
String factortwoStr = factortwo.getText().toString();
//7）將這兩個值存放到Intent對象當(dāng)中
Intent intent = new Intent();
//8)調(diào)用intent匆笤。put（）方法將鍵值對傳進(jìn)intent中去
intent.putExtra("one",factoroneStr);
intent.putExtra("two",factortwoStr);
//9)設(shè)置intent啟動哪一個Activity
intent.setClass(Activity03.this, ResultActivity.class);
//10)使用這個Intent對象來啟動ResultActivity-->調(diào)用現(xiàn)在的Activity的startActivity()方法研侣，以啟動跳轉(zhuǎn)
Activity03.this.startActivity(intent);
}

}

——————activity03_layout.xml——————

</RelativeLayout>

—————————ResultActivity————————

package com.example.activity03;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

//接收從Activity03中所傳入的值
//計算兩個值得乘積
//將計算結(jié)果顯示在Activity上-->要想顯示，最少應(yīng)該有一個TextView控件用來顯示-->要在ResultActivity的布局文件當(dāng)中配置一個TestView
//------以下步驟基本和Activity03類似------
//12)在result炮捧。xml中配置一個TextView
public class ResultActivity extends Activity{
//13）聲明TextView控件的對象
private TextView resultView;
//14)導(dǎo)入OnCreate（）方法的復(fù)寫文件
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
//15)使該Activity使用result庶诡。xml的布局
setContentView(R.layout.result);
//16)根據(jù)控件的Id來得到控件對象
resultView= (TextView)findViewById(R.id.result);
//得到intent對象中的值
//1、先得到intent對象
Intent intent = getIntent();
//2咆课、把Activity03中傳入的鍵再傳入intent末誓。getStringExtra（）方法中扯俱，以通過鍵得到值
String factoroneStr = intent.getStringExtra("one");
String factortwoStr = intent.getStringExtra("two");
//17)通過鍵得出的值都是String類型，無法相乘喇澡，所以還得轉(zhuǎn)化成整型-->用Integer迅栅。parseInt（）方法抽取一下
int factoroneInt = Integer.parseInt(factoroneStr);
int factortwoInt = Integer.parseInt(factortwoStr);
//18)計算兩個值得乘積
int result = factoroneInt * factortwoInt;
//19)在result的TextView中(resultView中)將結(jié)果顯示出來(注意：setText（）的輸出結(jié)果為String類型，所以要把結(jié)果轉(zhuǎn)化為字符串類型晴玖，其方法為：根據(jù)Java語法：連接符兩端有一端是字符串读存，另外一段也將會是字符串，然后顯示呕屎，所以相乘結(jié)果也是String類型)
resultView.setText(result + "");
}
}

—————————result.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" >
<TextView
android:id="@+id/result"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>

—————————string.xml——————————

<string name="app_name">Activity03</string>
<string name="hello_world">Hello world!</string>
<string name="action_settings">Settings</string>
<string name="symbol">乘以</string>
<string name="calculate">計算</string>
<string name="exit">退出</string>
<string name="about">關(guān)于</string>

</resources>

——————Activity03Manifest.xml———————

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.activity03"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".Activity03"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

</manifest>

——————————R.java———————————

/* AUTO-GENERATED FILE. DO NOT MODIFY.

This class was automatically generated by the
aapt tool from the resource data it found. It
should not be modified by hand.
*/

package com.example.activity03;

public final class R {
public static final class attr {
}
public static final class dimen {
/** Default screen margins, per the Android Design guidelines.

     Example customization of dimensions originally defined in res/values/dimens.xml
     (such as screen margins) for screens with more than 820dp of available width. This
     would include 7" and 10" devices in landscape (~960dp and ~1280dp respectively).

     */
    public static final int activity_horizontal_margin=0x7f040000;
    public static final int activity_vertical_margin=0x7f040001;
}
public static final class drawable {
    public static final int ic_launcher=0x7f020000;
}
public static final class id {
    public static final int action_settings=0x7f080005;
    public static final int calculate=0x7f080003;
    public static final int factorone=0x7f080000;
    public static final int factortwo=0x7f080002;
    public static final int result=0x7f080004;
    public static final int symbol=0x7f080001;
}
public static final class layout {
    public static final int activity03_layout=0x7f030000;
    public static final int result=0x7f030001;
}
public static final class menu {
    public static final int activity03=0x7f070000;
}
public static final class string {
    public static final int about=0x7f050006;
    public static final int action_settings=0x7f050002;
    public static final int app_name=0x7f050000;
    public static final int calculate=0x7f050004;
    public static final int exit=0x7f050005;
    public static final int hello_world=0x7f050001;
    public static final int symbol=0x7f050003;
}
public static final class style {
    /** 
    Base application theme, dependent on API level. This theme is replaced
    by AppBaseTheme from res/values-vXX/styles.xml on newer devices.


        Theme customizations available in newer API levels can go in
        res/values-vXX/styles.xml, while customizations related to
        backward-compatibility can go here.
    

    Base application theme for API 11+. This theme completely replaces
    AppBaseTheme from res/values/styles.xml on API 11+ devices.

API 11 theme customizations can go here.

    Base application theme for API 14+. This theme completely replaces
    AppBaseTheme from BOTH res/values/styles.xml and
    res/values-v11/styles.xml on API 14+ devices.

API 14 theme customizations can go here.
/
public static final int AppBaseTheme=0x7f060000;
/* Application theme.
All customizations that are NOT specific to a particular API-level can go here.
*/
public static final int AppTheme=0x7f060001;
}
}

以下是新寫代碼让簿，但bug仍未解決，估計是Activity03中,caiculate.setOnClickListener((android.view.view.OnClickListener)new calculateListener());方法錯誤秀睛，

原文中是：

caiculate.setOnClickListener(new calculateListener());

但我在Eclipse中這樣寫時調(diào)試報錯尔当。

————————Activity03————————

package com.example.actyvity03;

import android.app.Activity;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Activity03 extends Activity {
private EditText factorOne;
private EditText factorTwo;
private TextView symbol;
private Button calculate;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
factorOne=(EditText)findViewById(R.id.factorOne);
factorTwo=(EditText)findViewById(R.id.factorTwo);
symbol=(TextView)findViewById(R.id.symbol);
calculate=(Button)findViewById(R.id.calculate);
symbol.setText(R.string.symbol);
calculate.setText(R.string.calculate);
//下行標(biāo)記-->學(xué)習(xí)observe設(shè)計模式
calculate.setOnClickListener( (android.view.View.OnClickListener) new calculateListener());
}

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    menu.add(0, 1, 1, R.string.exit);
    menu.add(0,2,2,R.string.about);
    // TODO Auto-generated method stub
    return super.onPrepareOptionsMenu(menu);
    
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // TODO Auto-generated method stub
    return super.onOptionsItemSelected(item);
}

class calculateListener implements OnClickListener{

    @Override
    public void onClick(DialogInterface dialog, int which) {
        // TODO Auto-generated method stub
        String factorOneStr = factorOne.getText().toString();

        String factorTwoStr = factorTwo.getText().toString();
        Intent intent = new Intent();
        intent.putExtra("one", factorOneStr);
        intent.putExtra("two", factorTwoStr);
        intent.setClass(Activity03.this,ResultActivity.class);
        Activity03.this.startActivity(intent);
    }
    
}

}

——————activity03_layout（main）.xml——————

<EditText 
    android:id="@+id/factorOne"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    />
<TextView
    android:id="@+id/symbol"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/hello_world" />
<EditText 
    android:id="@+id/factorTwo"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    />
<Button
    android:id="@+id/calculate"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    />

</RelativeLayout>

—————————ResultActivity————————

package com.example.actyvity03;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class ResultActivity extends Activity {
private TextView resultView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.result);
    resultView=(TextView)findViewById(R.id.result);
    Intent intent = getIntent();
    String factorOneStr = intent.getStringExtra("one");
    String factorTwoStr = intent.getStringExtra("two");
    int factorOneint = Integer.parseInt(factorOneStr);
    int factorTwoint = Integer.parseInt(factorTwoStr);
    int result = factorOneint * factorTwoint ;
    resultView.setText(result + "");
    
}

}

—————————result.xml—————————

</LinearLayout>

——————Activity03Manifest.xml———————

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.actyvity03"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".Activity03"
        android:label="@string/app_name" >
    
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <ResultActivity
        android:name=".ResultActivity"
        android:label="@string/app_name"
        />
</application>

</manifest>

—————————string.xml——————————

<?xml version="1.0" encoding="utf-8"?>
<resources>

<string name="app_name">Actyvity03</string>
<string name="hello_world">Hello world!</string>
<string name="action_settings">Settings</string>
<string name="symbol">乘以</string>
<string name="calculate">計算</string>
<string name="exit">退出</string>
<string name="about">關(guān)于</string>

</resources>

——————————R.java———————————

/* AUTO-GENERATED FILE. DO NOT MODIFY.

This class was automatically generated by the
aapt tool from the resource data it found. It
should not be modified by hand.
*/

package com.example.actyvity03;

public final class R {
public static final class attr {
}
public static final class dimen {
/** Default screen margins, per the Android Design guidelines.

     Example customization of dimensions originally defined in res/values/dimens.xml
     (such as screen margins) for screens with more than 820dp of available width. This
     would include 7" and 10" devices in landscape (~960dp and ~1280dp respectively).

     */
    public static final int activity_horizontal_margin=0x7f040000;
    public static final int activity_vertical_margin=0x7f040001;
}
public static final class drawable {
    public static final int ic_launcher=0x7f020000;
}
public static final class id {
    public static final int action_settings=0x7f080005;
    public static final int calculate=0x7f080003;
    public static final int factorOne=0x7f080000;
    public static final int factorTwo=0x7f080002;
    public static final int result=0x7f080004;
    public static final int symbol=0x7f080001;
}
public static final class layout {
    public static final int main=0x7f030000;
    public static final int result=0x7f030001;
}
public static final class menu {
    public static final int activity03=0x7f070000;
}
public static final class string {
    public static final int about=0x7f050006;
    public static final int action_settings=0x7f050002;
    public static final int app_name=0x7f050000;
    public static final int calculate=0x7f050004;
    public static final int exit=0x7f050005;
    public static final int hello_world=0x7f050001;
    public static final int symbol=0x7f050003;
}
public static final class style {
    /** 
    Base application theme, dependent on API level. This theme is replaced
    by AppBaseTheme from res/values-vXX/styles.xml on newer devices.


        Theme customizations available in newer API levels can go in
        res/values-vXX/styles.xml, while customizations related to
        backward-compatibility can go here.
    

    Base application theme for API 11+. This theme completely replaces
    AppBaseTheme from res/values/styles.xml on API 11+ devices.

API 11 theme customizations can go here.

    Base application theme for API 14+. This theme completely replaces
    AppBaseTheme from BOTH res/values/styles.xml and
    res/values-v11/styles.xml on API 14+ devices.

最后編輯于：2017.12.03 06:05:16

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Android學(xué)習(xí)（Mars Android）——S01_E06--常見控件的使用方法（計算器）

以下程序有錯誤绅作，閃退 先mark下对湃，回頭改

————————Activity03————————

——————activity03_layout.xml——————

—————————ResultActivity————————

—————————result.xml—————————

—————————string.xml——————————

——————Activity03Manifest.xml———————

——————————R.java———————————

以下是新寫代碼让簿，但bug仍未解決，估計是Activity03中,caiculate.setOnClickListener((android.view.view.OnClickListener)new calculateListener());方法錯誤秀睛，

原文中是：

但我在Eclipse中這樣寫時調(diào)試報錯尔当。

————————Activity03————————

——————activity03_layout（main）.xml——————

—————————ResultActivity————————

—————————result.xml—————————

——————Activity03Manifest.xml———————

—————————string.xml——————————

——————————R.java———————————

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以下程序有錯誤绅作，閃退先mark下对湃，回頭改