一個容易讀取手機聯繫人的方法, Activity.managedQuery()

本例子通過調用 Activity.managedQuery() 方法讀取手機聯繫人.

package com.AndroidContacts;



import android.app.ListActivity;

import android.database.Cursor;

import android.os.Bundle;

import android.provider.Contacts.People;

import android.widget.SimpleCursorAdapter;



public class AndroidContactsActivity extends ListActivity {

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        

        String[] projection = {People._ID, People.NAME};

        Cursor cursor = managedQuery(

        		People.CONTENT_URI,		//Uri				

        		projection, 			//projection

        		null, 					//selection

        		null, 					//selection arguments

        		People.NAME);			//Sort by



        String[] name = new String[] {People.NAME};

        int[] text1 = new int[] {android.R.id.text1};

        SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,

        		android.R.layout.simple_list_item_1, 

        		cursor, 

        		name, 

        		text1);

        

        setListAdapter(adapter);

    }

}

最後, 需要修改 AndroidManifest.xml 文件, 添加 "android.permission.READ_CONTACTS" 權限

Android SDK 的谷歌電視附加功能預覽

隨著即將到來的 Android 操作系統升級到蜂窩，谷歌電視將兼容 Android。這意味著開發人員可以優化現有的移動手機或平板電腦，創建對應谷歌電視的 Android App，並通過 Android市場分發這些應用程序。

詳情:
- Preview of Google TV Add-on for the Android SDK

實施廣播接收器(BroadcastReceiver)檢測USB大容量存儲模式(USB Mass Storage mode)

檢測USB大容量存儲(USB Mass Storage)的連接(Connected)和斷開(Disconnected)模式之間的轉換, 我們可以擴展廣播接收器(BroadcastReceiver), 處理 Intent.ACTION_UMS_CONNECTED 和 Intent.ACTION_UMS_DISCONNECTED 事件. 此事件會在通過 USB 連接和斷開時發生.



實例:

package com.AndroidUSB;



import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.widget.TextView;



public class AndroidUSBActivity extends Activity {

	

	TextView umsState;

	

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        umsState = (TextView)findViewById(R.id.ums_state);

        

        registerReceiver(receiverUmsConnected, new IntentFilter(Intent.ACTION_UMS_CONNECTED));

		registerReceiver(receiverUmsDisConnected, new IntentFilter(Intent.ACTION_UMS_DISCONNECTED));

        

    }



	BroadcastReceiver receiverUmsConnected

    = new BroadcastReceiver(){



		@Override

		public void onReceive(Context arg0, Intent arg1) {

			// TODO Auto-generated method stub

			umsState.setText("USB Mass Storage Connected");

		}};

		

	BroadcastReceiver receiverUmsDisConnected

	= new BroadcastReceiver(){



		@Override

		public void onReceive(Context arg0, Intent arg1) {

			// TODO Auto-generated method stub

			umsState.setText("USB Mass Storage Disconnected");

				

		}};

}

更改應用程序的標題(Title)

更改應用程序的標題, 我們可以使用Java代碼調用 setTitle() 函數.

例如:

	setTitle("Test");

通過意圖(Intent)啟動其他應用程序共享文本

有時我們希望與別人分享一些東西, 我們可以通過 Intent.ACTION_SEND 意圖(Intent), 設置類型"text/plain", 啟動其他共享應用程序, 例如 email, SMS...

實例:

package com.AndroidShareText;

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 AndroidShareTextActivity extends Activity {
 
 EditText TextInput;
 Button buttonShare;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       TextInput = (EditText)findViewById(R.id.input);
    buttonShare = (Button)findViewById(R.id.share);
    
    buttonShare.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    
    String textToBeSent = TextInput.getText().toString();
    
    Intent intent = new Intent(Intent.ACTION_SEND);
    intent.setType("text/plain");
    intent.putExtra(Intent.EXTRA_TEXT, textToBeSent);
    startActivity(Intent.createChooser(intent, "Share..."));
   }});
      
   }
}

<?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:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<EditText
 android:id="@+id/input"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
<Button
 android:id="@+id/share"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Share"
   />
</LinearLayout>

通過Java 碼在編輯文本(EditText)旁邊放置圖標, setCompoundDrawablesWithIntrinsicBounds

通過 setCompoundDrawablesWithIntrinsicBounds() 方法可在編輯文本(EditText)旁邊放置圖標.

實例:

package com.AndroidEditText;

import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class AndroidEditTextActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        final EditText input = (EditText)findViewById(R.id.input);
        Button buttonClear = (Button)findViewById(R.id.clear);
        buttonClear.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    input.setText("");
   }});
        
        Drawable icon = getResources().getDrawable(R.drawable.icon);
        
        input.setCompoundDrawablesWithIntrinsicBounds(
          icon,  //left
          icon,  //top
          icon,  //right
          icon); //bottom

    }
}

相關文章:
- 通過XML在編輯文本(EditText)旁邊放置圖標

通過XML在編輯文本(EditText)旁邊放置圖標

在佈局文件(mian.xml)中, 使用android:drawableLeft, drawableTop, drawableRight 和 drawableLeft 可在編輯文本(EditText)旁邊放置圖標.

實例:

<EditText  
 android:id="@+id/input"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    android:hint="請輸入" 
    android:layout_alignParentLeft="true"
    android:layout_toLeftOf="@id/clear"
    android:drawableRight="@drawable/icon"/>

相關文章:
- 通過Java 碼在編輯文本(EditText)旁邊放置圖標, setCompoundDrawablesWithIntrinsicBounds