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Android学习（Mars Android）——S01_E06

Android学习（Mars Android）——S01_E06

作者: Honour_Lee | 来源:发表于2016-05-30 21:16 被阅读0次

    以下程序有错误，闪退 先mark下，回头改

    ————————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、 在Activity03中什声明四个控件：2个EditText（数字输入框），1个TextView（乘以），1个Button（计算）。-->修改activity03_layout。xml文件
    //2、要为其中的两个控件（1个TextView（乘以）、1个Button（计算））设置显示的值
    //3、创建一个监听器类，用来监听按钮按下的动作
    //4、将监听器类的对象绑定在按钮对象上

    public class Activity03 extends Activity {
    //1）在cativity03_layout.xml中声明好了四个控件过后，
    //2）在Activity中将这四个控件取出来：-->声明代表这四个控件的对象-->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)根据控件的ID来取得代表控件的对象-->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)为symbol和calculate设置显示的值
    //方法一：直接写入字符串“乘以”/“计算”。有点：简单方便；缺点：考虑到范围可能会有多种语言，直接赋值的方式，修改起来非常麻烦
    //symbol.setText("乘以");
    //calculate.setText("计算");
    // 方法二：1）在string中配置字符串，然后由Activity03调用----推荐！
    //（）内不再是字符串，而是对应的Id.优点：应用程序中并无相应的值，只有其Id，真正的值在strings.xml中，如需修改，只需要在strings.xml中修改
    symbol.setText(R.string.symbol);
    calculate.setText(R.string.calculate);
    //11)将监听器对象绑定到按钮(calculate)对象上面去
    calculate.setOnClickListener(new CalculateListener());

    }

    //20)添加Menu菜单，回调函数，当在手机上电极Menu按钮时就会执行该函数---Menu于前面EditText，Button等相比，不需要在布局文件中进行配置，直接复写onCreatextMenuClosed（方法）即可
    //该方法的作用是，当客户点击Menu按钮时候，就会调用该方法
    @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)给退出/关于添加动作--->当点击Item时就会有动作，并把点击的值传进（item）去
    //当客户点击菜单中的某一个选项时，会调用该方法，并把点击的选项最为参数传进去
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
    if(item.getItemId()==1);
    finish();
    // TODO Auto-generated method stub
    return super.onOptionsItemSelected(item);
    }

    //5)编写应用程序的监听器(内部类，比较常见的，eg：在多线程程序中使用内部类来隐藏run函数；在编写模板回调模式时使用匿名内部类作为回调接口的实现)
//1、在内部类中，可以直接使用外部类的成员变量，但不能拥有；2、可以再内部类中使用外部类的成员函数/对象
//如果对Listener不太了解，可以Google“Observer设计模式”-->有助于了解Listener
class CalculateListener implements OnClickListener{

@Override
    public void onClick(View v) {

    //6)取得两个EditText控件的值
    String factoroneStr = factorone.getText().toString();
    String factortwoStr = factortwo.getText().toString();
    //7）将这两个值存放到Intent对象当中
    Intent intent = new Intent();
    //8)调用intent。put（）方法将键值对传进intent中去
    intent.putExtra("one",factoroneStr);
    intent.putExtra("two",factortwoStr);
    //9)设置intent启动哪一个Activity
    intent.setClass(Activity03.this, ResultActivity.class);
    //10)使用这个Intent对象来启动ResultActivity-->调用现在的Activity的startActivity()方法，以启动跳转
    Activity03.this.startActivity(intent);
    }

    }

    }

    ——————activity03_layout.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="com.example.activity03.Activity03" >
    <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"
    />

    <Editext
    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.activity03;

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

    //接收从Activity03中所传入的值
    //计算两个值得乘积
    //将计算结果显示在Activity上-->要想显示，最少应该有一个TextView控件用来显示-->要在ResultActivity的布局文件当中配置一个TestView
    //------以下步骤基本和Activity03类似------
    //12)在result。xml中配置一个TextView
    public class ResultActivity extends Activity{
    //13）声明TextView控件的对象
    private TextView resultView;
    //14)导入OnCreate（）方法的复写文件
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    //15)使该Activity使用result。xml的布局
    setContentView(R.layout.result);
    //16)根据控件的Id来得到控件对象
    resultView= (TextView)findViewById(R.id.result);
    //得到intent对象中的值
    //1、先得到intent对象
    Intent intent = getIntent();
    //2、把Activity03中传入的键再传入intent。getStringExtra（）方法中，以通过键得到值
    String factoroneStr = intent.getStringExtra("one");
    String factortwoStr = intent.getStringExtra("two");
    //17)通过键得出的值都是String类型，无法相乘，所以还得转化成整型-->用Integer。parseInt（）方法抽取一下
    int factoroneInt = Integer.parseInt(factoroneStr);
    int factortwoInt = Integer.parseInt(factortwoStr);
    //18)计算两个值得乘积
    int result = factoroneInt * factortwoInt;
    //19)在result的TextView中(resultView中)将结果显示出来(注意：setText（）的输出结果为String类型，所以要把结果转化为字符串类型，其方法为：根据Java语法：连接符两端有一端是字符串，另外一段也将会是字符串，然后显示，所以相乘结果也是String类型)
    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——————————

    <resources>

    <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">计算</string>
<string name="exit">退出</string>
<string name="about">关于</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;
    }
    }

    以下是新写代码，但bug仍未解决，估计是Activity03中,caiculate.setOnClickListener((android.view.view.OnClickListener)new calculateListener());方法错误，

    原文中是：

    caiculate.setOnClickListener(new calculateListener());

    但我在Eclipse中这样写时调试报错。

    ————————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);
    //下行标记-->学习observe设计模式
    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——————

    <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="com.example.actyvity03.Activity03" >

    <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—————————

    <?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>

    ——————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">计算</string>
<string name="exit">退出</string>
<string name="about">关于</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.

    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;
    }
    }

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