Android學習筆記 - 長按選單(ContextMenu)

1. 在螢幕按下2至3秒之後出現選單，這是使用ContextMenu物件來達到此效果

2. 需覆寫onCreateContextMenu及onContextItemSelected這二個方法

3. MainActivity.java

import android.app.Activity;
import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MenuItem;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        LinearLayout windowLayout = (LinearLayout) findViewById(R.id.windowLayout);
        //註冊長按選單
        this.registerForContextMenu(windowLayout);
    }


    @Override
    public boolean onContextItemSelected(MenuItem item) {
        //當使用者點選項目時，所需的動作
        Toast.makeText(this, "您選擇的是"+item.getTitle(), Toast.LENGTH_SHORT).show();
        return super.onContextItemSelected(item);
    }


    @Override
    public void onCreateContextMenu(ContextMenu contextMenu, View view, ContextMenuInfo menuInfo) {
        //設定選單內容
        super.onCreateContextMenu(contextMenu, view, menuInfo);
        contextMenu.add(0, 0, 0, "紅茶");
        contextMenu.add(0, 1, 0, "奶茶");
        contextMenu.add(0, 2, 0, "綠茶");
        contextMenu.add(0, 3, 0, "青茶");
    }
}

3. main.xml(Layout)

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/windowLayout">
</LinearLayout>

4. 執行之後的畫面。

Android學習筆記 - 網格視圖(GridView)

1. 利用網格視圖(GridView)物件來呈現項目列表

2. MainActivity.java

package org.me.android_gridview;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.Toast;

public class MainActivity extends Activity {
    private GridView gridView;
    
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        gridView = (GridView) findViewById(R.id.gridView);
        final String[] list = new String[]{"王建民","郭泓志","倪福德","胡金龍"};
        //設定列表內容
        ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,list);
        //設定列數
        gridView.setNumColumns(2);
        gridView.setAdapter(adapter);
        //項目被點選時，回應的動作
        gridView.setOnItemClickListener(new GridView.OnItemClickListener(){
           @Override
           public void onItemClick(AdapterView adapterView,View view,int position,long id) {
               Toast.makeText(MainActivity.this, "您選擇的是"+list[position], Toast.LENGTH_SHORT).show();
           }
        });
    }
}

3. main.xml(Layout)

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">" 
    <GridView
        android:id="@+id/gridView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
    </GridView>
</LinearLayout>

4. 執行之後的畫面。

Android學習筆記 - 自動填入文字(AutoCompleteTextView)

1. 利用(AutoCompleteTextView)物件來達到自動填入文字

2. MainActivity.java

package org.me.android_autocompletetextview;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class MainActivity extends Activity {
    private AutoCompleteTextView autoComplete;
    
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        autoComplete = (AutoCompleteTextView) findViewById(R.id.autoComplete);
        String[] phone = new String[]{"0986254878","0985225787","098525879","0985012486","0985658745"};
        //設定自動填入的文字內容
        ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item,phone);
        autoComplete.setAdapter(adapter);
    }
}

3. main.xml(Layout)

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">" 
    <AutoCompleteTextView
        android:id="@+id/autoComplete"
        android:layout_width="fill_parent"
        android:layout_height="50px">
    </AutoCompleteTextView>
</LinearLayout>

4. 在「自動填入文字框」輸入文字之後出現的畫面。

Android學習筆記 - 下拉式選單(Spinner)

1. 透過Spinner物件建立下拉式選單

2. MainActivity.java

package org.me.android_spinner;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        Spinner spinner = (Spinner) findViewById(R.id.spinnner);
        //建立一個ArrayAdapter物件，並放置下拉選單的內容
        ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item,new String[]{"紅茶","奶茶","綠茶"});
        //設定下拉選單的樣式
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);
        //設定項目被選取之後的動作
        spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
            public void onItemSelected(AdapterView adapterView, View view, int position, long id){
                Toast.makeText(MainActivity.this, "您選擇"+adapterView.getSelectedItem().toString(), Toast.LENGTH_LONG).show();
            }
            public void onNothingSelected(AdapterView arg0) {
                Toast.makeText(MainActivity.this, "您沒有選擇任何項目", Toast.LENGTH_LONG).show();
            }
        });
    }
}

3. main.xml(Layout)

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView
        android:id="@+id/textView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">
    </TextView>
    <Spinner
        android:id="@+id/spinnner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
    </Spinner>
</LinearLayout>

4. 下拉式選單畫面

HTC Hero 將升級為Android 2.1版

HTC於Plurk公告將於2010年4月底前透過無線更新的方式,

將HTC Hero 升級為Android 2.1版本,並同時升級

新版HTC SENSE Experience之支援服務。

有使用的人可以先備份手機準備更新囉… 

From HTC Hero Plurk

Present Perfect Continuous(現在完成進行式)

Present Perfect Continuous簡單來說就是發生在過去到現在持續的事件

以下是Present Perfect Continuous發生的時機
1. 從過去開始並持續到現在
   e.g. I have been watching TV for two hours.

2. 最近
   e.g. I have been watching TV lately.

Past Continuous(過去進行式)

Past Continuous簡單來說就是發生在過去的Long Action，而Simple Past就是發生在過去的Short Action

以下是Past Continuous發生的時機：
1. 在過去被中斷的動作
   e.g. While I was reading , he called.
        I was reading when he called.

2. 特定一個時間點發生
   e.g. I was reading last night at 7.
        At midnight, I was reading.

3. 過去並行的動作
   e.g. I was reading while he was watching TV.

4. 過去常常重覆的動作
   e.g. I was always working late.

Android學習筆記 - 傳遞參數到下一個Activity

1. 透過Bundle物件傳遞參數到下一個Activity

2. 第一個Activity(MainActivity.java)

package org.me.android_transferparam;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {
    private Button nextButton;
    private EditText nameEdit;
    private EditText phoneEdit;

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        //載入所有的Widget
        loadWidget();
        
        nextButton.setOnClickListener(new Button.OnClickListener(){
           @Override
           public void onClick(View view){
               //傳送參數到下一個Actitity
               deliverToNextActitity();
           }
        });
    }

    public void deliverToNextActitity(){
        //建立一個bundle物件，並將要傳遞的參數放到bundle裡
        Bundle bundle = new Bundle();
        bundle.putString("name", nameEdit.getText().toString());
        bundle.putString("phone", phoneEdit.getText().toString());
        Intent intent = new Intent();
        //設定下一個Actitity
        intent.setClass(this, SecondActivity.class);
        intent.putExtras(bundle);
        //開啟Activity
        startActivity(intent);
    }

    private void loadWidget(){
        nextButton = (Button) findViewById(R.id.nextButton);
        nameEdit = (EditText) findViewById(R.id.nameEdit);
        phoneEdit = (EditText) findViewById(R.id.phoneEdit);
    }
}

3. 第二個Activity(SecondActivity.java)

package org.me.android_transferparam;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class SecondActivity extends Activity {

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.second);
        TextView content = (TextView) findViewById(R.id.content);
        Button backButton = (Button) findViewById(R.id.backButton);
        //取得前一個Activity傳過來的Bundle物件
        Bundle bundle = getIntent().getExtras();
        content.setText("姓名："+bundle.getString("name")+"   電話："+bundle.getString("phone"));

        backButton.setOnClickListener(new Button.OnClickListener(){
           @Override
           public void onClick(View view){
               //結束此Activity
               finish();
           }
        });
    }
}

4. main.xml(Layout)

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
    android:id="@+id/widget149"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    >
    <EditText
        android:id="@+id/nameEdit"
        android:layout_width="100px"
        android:layout_height="36px"
        android:layout_x="58px"
        android:layout_y="12px"
        >
    </EditText>
    <TextView
        android:id="@+id/nameText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="姓名："
        android:layout_x="0px"
        android:layout_y="18px"
        >
    </TextView>
    <TextView
        android:id="@+id/phoneText"
        android:layout_width="wrap_content"
        android:layout_height="-12px"
        android:text="電話："
        android:layout_x="-1px"
        android:layout_y="62px"
        >
    </TextView>
    <EditText
        android:id="@+id/phoneEdit"
        android:layout_width="100px"
        android:layout_height="36px"
        android:layout_x="58px"
        android:layout_y="57px"
        >
    </EditText>
    <Button
        android:id="@+id/nextButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="傳送到下一個Activity"
        android:layout_x="4px"
        android:layout_y="103px"
        >
    </Button>
</AbsoluteLayout>

5. second.xml(Layout)

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">"
    <TextView
        android:id="@+id/content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
    </TextView>
    <Button
        android:id="@+id/backButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="回前一個Activity">
    </Button>
</LinearLayout>

6. 程式啟動及輸入參數之後的畫面

Gogobox搜尋引擎 - 100 Box

關大家自從fXXd box及2x XD關站之後，都不知道要到哪裡搜尋Box了…

介紹一個利用Google自訂搜尋所做的Gogobox搜尋引擎 100 Box

 

 

Android學習筆記 - 多選項對話框(Dialog)

1. 利用AlertDialog物件來顯示對話框，並利用字串陣列來標示選項的標題。

2. MainActivity.java

package org.me.android_multiitemdialog;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

    private Button showDialogButton;
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        showDialogButton = (Button) findViewById(R.id.showDialogButton);
        final AlertDialog mutiItemDialog = getMutiItemDialog(new String[]{"牛排","雞排","豬排"});

        showDialogButton.setOnClickListener(new Button.OnClickListener(){
            @Override
            public void onClick(View view){
                //顯示對話框
                mutiItemDialog.show();
            }
        });
    }

    public AlertDialog getMutiItemDialog(final String[] items) {
        Builder builder = new Builder(this);
        //設定對話框內的項目
        builder.setItems(items, new DialogInterface.OnClickListener(){
           @Override
           public void onClick(DialogInterface dialog,int which){
               //當使用者點選對話框時，顯示使用者所點選的項目
               Toast.makeText(MainActivity.this, "您選擇的是"+items[which], Toast.LENGTH_SHORT).show();
           }
        });
        return builder.create();
    }
}

3. main.xml(Layout)

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">" 
    <Button
        android:id="@+id/showDialogButton"
        android:layout_width="150px"
        android:layout_height="50px"
        android:text="多個選項的對話框">
    </Button>
</LinearLayout>

4. 按下「多個選項的對話框」按鈕之後出現的畫面。

Android學習筆記 - 對話框(Dialog)

1. 利用AlertDialog物件來顯示對話框。

2. MainActivity.java

package org.me.android_dialog;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
    private Button dialogButton;
    
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        dialogButton = (Button) findViewById(R.id.dialogButton);
        final AlertDialog alertDialog = getAlertDialog("這是一個對話框","請選擇......");
        dialogButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(final View view) {
                //顯示對話框
                alertDialog.show();
            }
        });
    }

    private AlertDialog getAlertDialog(String title,String message){
        //產生一個Builder物件
        Builder builder = new AlertDialog.Builder(MainActivity.this);
        //設定Dialog的標題
        builder.setTitle(title);
        //設定Dialog的內容
        builder.setMessage(message);
        //設定Positive按鈕資料
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //按下按鈕時顯示快顯
                Toast.makeText(MainActivity.this, "您按下OK按鈕", Toast.LENGTH_SHORT).show();
            }
        });
        //設定Negative按鈕資料
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //按下按鈕時顯示快顯
                Toast.makeText(MainActivity.this, "您按下Cancel按鈕", Toast.LENGTH_SHORT).show();
            }
        });
        //利用Builder物件建立AlertDialog
        return builder.create();
    }
}

3. main.xml(Layout)

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">" 
    <Button
        android:id="@+id/dialogButton"
        android:layout_width="95px"
        android:layout_height="40px"
        android:text="ShowDialog"
        >
    </Button>
</LinearLayout>

4. 按下ShowDialog按鈕之後出現的畫面

Android學習筆記 - 顯示快顯(Toast)

1. 利用Toast物件來顯示快顯。

2. MainActivity.java

package org.me.android_toast;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
    private Button toastButton;

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        toastButton = (Button) findViewById(R.id.toastButton);

        //設定按鈕的ClickListener
        toastButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View view) {
                //當使用者按下按鈕時顯示Toast
                //Toast.LENGTH_LONG表示顯示時間較長，Toast.LENGTH_SHORT則表示顯示時間較短
                Toast.makeText(view.getContext(), "這是一個Toast......", Toast.LENGTH_LONG).show();
            }
        });
    }
}

3. main.xml(Layout)

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <Button
        android:id="@+id/toastButton"
        android:layout_width="90px"
        android:layout_height="37px"
        android:text="ShowToast">
    </Button>
</LinearLayout>

4. 按下ShowToast按鈕之後出現的畫面

Android學習筆記 - 建立選單(Menu)

1. 利用覆寫onCreateOptionsMenu, onOptionsItemSelected這二個方法來建立選單。

2. MainActivity.java

package org.me.android_menu;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {
    private TextView describe;

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        describe = (TextView) findViewById(R.id.describe);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        //參數1:群組id, 參數2:itemId, 參數3:item順序, 參數4:item名稱
        menu.add(0, 0, 0, "說明");
        menu.add(0, 1, 1, "離開");
        return super.onCreateOptionsMenu(menu);
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        //依據itemId來判斷使用者點選哪一個item
        switch(item.getItemId()) {
            case 0:
                //在TextView上顯示說明
                describe.setText("這是說明............");
                break;
            case 1:
                //結束此程式
                finish();
                break;
            default:
        }
        return super.onOptionsItemSelected(item);
    }
}

3. main.xml(Layout)

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">" 
    <TextView
        android:id="@+id/describe"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text=""/>
</LinearLayout>

4. 按下MENU鍵之後出現及點選「說明」之後出現的畫面