android:桌面widget，桌面记事本

实现功能：桌面创建多个记事，每个记事本可以分别更新内容

1，manifest.xml：

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.edl.mininote" android:versionCode="1" android:versionName="1.0">
 4     <uses-permission android:name="android.permission.CALL_PHONE"></uses-permission>
 5     <!-- 设置发送短信的权限 -->  
 6     <uses-permission android:name="android.permission.SEND_SMS"></uses-permission>
 7     <uses-permission android:name="android.permission.MOUT_UNMOUNT_FILESYSTEMS"/>
 8     
 9     <application
10         android:icon="@drawable/icon"  android:label="@string/app_name" >
11         
12         <receiver android:name=".MiniWidgetProvider">  
13             <meta-data android:name="android.appwidget.provider"  
14                 android:resource="@xml/widget_provider" />
15             <intent-filter>  
16                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
17             </intent-filter>
18         </receiver>
19         
20         <activity android:name=".MiniNoteConfige"
21                 android:theme="@android:style/Theme.Black.NoTitleBar"
22                 android:configChanges="keyboardHidden|orientation|screenLayout"
23             >
24             <intent-filter>
25                 <action android:name="android.appwidget.action.APPWIDGET_CONFIGURE"/>
26             </intent-filter>
27         </activity>     
28     </application>
29 </manifest>

2，xml配置文件：（res中新建xml文件夹，新建文件内容如下）

1 <?xml version="1.0" encoding="utf-8"?>
2     <appwidget-provider 
3         xmlns:android="http://schemas.android.com/apk/res/android"    
4         android:minWidth="120dip"    
5         android:minHeight="150dip"    
6         android:updatePeriodMillis="0"
7         android:configure="com.edl.mininote.MiniNoteConfige" //打开文件首先进入的activity
8         android:initialLayout="@layout/mininote" //布局文件
9 />

minWidth: 定义Wdiget组件的宽度
minHeight: 定义Wdiget组件的高度
updatePeriodMillis: 更新的时间周期,如果不需要定时更新值设置为0

android:configure="com.edl.mininote.MiniNoteConfige" 如果需要在启动前先启动一个Activity进行设置，在这里给出Activity的完整类名

android:initialLayout="@layout/mininote" 此句为指定桌面组件的布局文件。

3，layout:文件：

<1> mininote.xml:

View Code

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout 
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     android:background="@drawable/edit_bg_yellow"
 5     android:focusable="true"  
 6     android:clickable="true"
 7     android:layout_width="fill_parent" 
 8     android:layout_height="fill_parent" 
 9     android:id="@+id/mininote_rl">
10     <ImageView 
11         android:id="@+id/new_btn" 
12         android:layout_width="60dip" 
13         android:layout_height="25dip" 
14         android:layout_marginTop="8dip" 
15         android:layout_marginRight="-5dip" 
16         android:src="@drawable/postit_s1_add_yellow" 
17         android:scaleType="matrix" 
18         android:paddingLeft="35dip"
19         android:layout_alignParentTop="true" 
20         android:layout_alignParentRight="true" />
21     <TextView 
22         android:focusable="true"  android:clickable="true"
23         android:textColor="#ff000000" 
24         android:id="@+id/body_txt" 
25         android:fadingEdge="vertical" 
26         android:fadingEdgeLength="25.0dip" 
27         android:layout_width="wrap_content" 
28         android:layout_height="wrap_content"
29         android:layout_marginLeft="5.0dip" 
30         android:layout_marginTop="24.0dip" 
31         android:layout_marginRight="3.0dip" 
32         android:layout_marginBottom="5.0dip" 
33         android:layout_alignParentLeft="true" 
34         android:layout_alignParentTop="true" 
35         android:lineSpacingExtra="5.0px" />
36     
37     <ImageView 
38             android:visibility="gone"
39             android:layout_gravity="center" 
40             android:id="@+id/no_data_img"
41              android:layout_width="wrap_content" 
42              android:layout_height="wrap_content" 
43              android:layout_marginLeft="2.0px" 
44              android:layout_marginTop="5.0dip" 
45              android:layout_toRightOf="@id/body_txt"
46              android:layout_alignTop="@id/body_txt"
47              android:src="@drawable/memo_noiconimage_18" />
48 </RelativeLayout>

<2>editer.xml:

View Code

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout 
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     android:id="@+id/launch_linear"
 5     android:layout_width="fill_parent" 
 6     android:layout_height="fill_parent"
 7     android:background="@drawable/edit_bg_yellow"
 8     android:orientation="vertical"
 9     >
10     <LinearLayout 
11         android:layout_height="fill_parent"  
12         android:layout_width="fill_parent" 
13         android:layout_weight="2">  
14         <view 
15                 class="com.edl.mininote.EditView"
16                 android:id="@+id/et_content"
17                 android:layout_width="fill_parent"
18                 android:layout_height="wrap_content"
19                 android:layout_marginTop="30dip"
20                 style="?android:attr/textViewStyle"
21                 android:background="@android:color/transparent"
22                 android:padding="5dip"
23                 android:scrollbars="vertical"
24                 android:fadingEdge="vertical"
25                 android:gravity="top|left"
26                 android:editable="true"
27                 android:cursorVisible="true"
28                 android:textColor="@color/black"
29                 android:textSize="22sp"
30                 android:capitalize="sentences"
31                 android:imeOptions="actionDone" 
32             />       
33     </LinearLayout>  
34     
35     <LinearLayout
36         android:layout_width="fill_parent"
37         android:layout_height="60dip"
38         android:orientation="horizontal"
39         android:layout_marginTop="2dip"
40         android:layout_marginBottom="2dip"
41         android:layout_weight="1" 
42         >
43         <View
44             android:layout_width="3dip"
45             android:layout_height="fill_parent" />
46        <Button
47             android:id="@+id/save"
48             android:layout_width="fill_parent"
49             android:layout_height="wrap_content"
50             android:background="@drawable/selector"
51             android:focusable="true"
52             android:text="@string/save"
53             android:textColor="@color/white"
54             android:textSize="16.0dip" 
55             android:layout_weight="1" />
56         <Button
57             android:id="@+id/cancel"
58             android:layout_width="fill_parent"
59             android:layout_height="wrap_content"
60             android:background="@drawable/selector"
61             android:focusable="true"
62             android:nextFocusRight="@id/cancel"
63             android:text="@string/cancel"
64             android:textColor="@color/white"
65             android:textSize="16.0dip"
66             android:layout_weight="1"  />
67         <View
68             android:layout_width="3dip"
69             android:layout_height="fill_parent" />
70     </LinearLayout>    
71 </LinearLayout>

4，java文件：

<1> 继承自AppWidgetProvider的类

View Code

 1 public class MiniWidgetProvider extends AppWidgetProvider {
 2     private static String TAG = "MiniWidgetProvider";
 3     final String mPerfName = "com.edl.mininote.MiniNote";
 4     private RemoteViews views ;
 5     private static String CLICK_NAME_ACTION = "com.edl.mininote.action.APPWIDGET_CLICKED";
 6     
 7 //    private int memoId,color;
 8     @Override
 9     public void onUpdate(Context context, AppWidgetManager appWidgetManager,
10             int[] appWidgetIds) {
11         DBHelper helper = new DBHelper(context);
12         for (int appWidgetId : appWidgetIds) {
13             int[] specificAppWidget = new int[] { appWidgetId };
14             Log.i(TAG, "onUpdate------specificAppWidget= " + specificAppWidget);
15             RemoteViews views = updateWidget(context, appWidgetId, helper);
16             appWidgetManager.updateAppWidget(specificAppWidget, views);
17         }
18         helper.close();
19     }
20 
21     @Override
22     public void onReceive(Context context, Intent intent) {
23         Log.i(TAG, "onReceive----------");
24         super.onReceive(context, intent);
25     }
26     
27     @Override
28     public void onDeleted(Context context, int[] appWidgetIds) {
29         // TODO Auto-generated method stub
30         DBHelper helper = new DBHelper(context);
31         for (int appWidgetId : appWidgetIds) {
32             int[] specificAppWidget = new int[] { appWidgetId };
33             helper.deleteNote(appWidgetId);
34         }
35         helper.close();
36     }
37     
38     public static RemoteViews updateWidget(Context context, int appWidgetId, DBHelper helper){
39            Log.i(TAG, "buildUpdate------appWidgetId= " + appWidgetId);
40            boolean isEmpty = false;
41             String text = helper.getText(appWidgetId);
42             int color =  helper.getColor(appWidgetId);
43             if (!TextUtils.isEmpty(text)) {//text != null
44                 Log.i(TAG, "buildUpdate------text != null ");
45                 RemoteViews views = new RemoteViews(context.getPackageName(),R.layout.mininote);
46                 views.setTextViewText(R.id.body_txt, text);
47                 views.setViewVisibility(R.id.no_data_img, View.GONE);
48                 Intent sendintent = new Intent(context, MiniNoteConfige.class);
49                 Log.i("sendintent", "sendintent");
50                 sendintent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
51                 sendintent.putExtra("hasindb", true);
52                 sendintent.putExtra("text", text);
53                 sendintent.setAction(String.valueOf(appWidgetId));
54                 //sendintent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK );
55                 PendingIntent temp = PendingIntent.getActivity(context, 0,
56                         sendintent,0);
57                 views.setOnClickPendingIntent(R.id.body_txt,temp);
58                 views.setOnClickPendingIntent(R.id.mininote_rl,temp);
59                 isEmpty = false;
60                 views = setColor(views,color,isEmpty);
61                // views.setImageViewBitmap(R.id.TextView01, text);
62                 return views;
63             } else {
64                 RemoteViews views = new RemoteViews(context.getPackageName(),R.layout.mininote);
65                 String defaulttext = context.getString(R.string.app_name);
66                  views.setTextViewText(R.id.body_txt, defaulttext);
67                  views.setViewVisibility(R.id.no_data_img, View.VISIBLE);
68                     Intent sendintent = new Intent(context, MiniNoteConfige.class);
69                     Log.i("sendintent", "sendintent");
70                     sendintent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
71                     sendintent.putExtra("hasindb", true);
72                     sendintent.putExtra("text", text);
73                     sendintent.setAction(String.valueOf(appWidgetId));
74                     //sendintent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK );
75                     PendingIntent temp = PendingIntent.getActivity(context, 0,
76                             sendintent,0);
77                     views.setOnClickPendingIntent(R.id.body_txt,temp);
78                     views.setOnClickPendingIntent(R.id.mininote_rl,temp);
79                     isEmpty = true;
80                     views = setColor(views,color,isEmpty);
81                     return views;
82             }
83         }
84     //设置背景显示
85 ……………………
86     
87 }

<2> edit界面：MiniNoteConfige.java //打开widget进入的activity

View Code

  1 public class MiniNoteConfige extends Activity implements OnClickListener {
  2     private String TAG = "MiniNoteConfige";
  3     
  4 //    final String mPerfName = "com.edl.mininote.MiniNoteConf";
  5 //    public static final Uri CONTENT_URI = Uri.parse("content://com.edl.mininote.provider/memo");
  6     
  7     private int mAppWidgetId = -1;
  8     private String content;
  9     boolean hasindb;
 10     boolean isSaveInDb = true;
 11     
 12     private Button mSaveBut;
 13     private Button mCancelBut;
 14     private EditText mEditText;
 15     private LinearLayout mLLContent;
 16     
 17     public int oldColor= 0 ;
 18     public int newColor = -1;
 19     
 20     private ArrayList<Map<String,Object>> colorItem ;
 21     private static final int Menu_send = Menu.FIRST;
 22     private static final int Menu_save = Menu.FIRST + 1;
 23     private static final int Menu_color = Menu.FIRST + 2;
 24     
 25     @Override
 26     protected void onCreate(Bundle savedInstanceState) {
 27         setContentView(R.layout.editer);
 28         mSaveBut  = (Button) findViewById(R.id.save);
 29         mSaveBut.setOnClickListener(this);
 30         mCancelBut = (Button) findViewById(R.id.cancel);
 31         mCancelBut.setOnClickListener(this);
 32         mEditText = (EditText) findViewById(R.id.et_content);
 33         mLLContent =( LinearLayout) findViewById(R.id.launch_linear);
 34         
 35         mAppWidgetId = getIntent().getIntExtra( AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
 36         hasindb = getIntent().getBooleanExtra("hasindb", false);
 37         // text = getIntent().getStringExtra("text");
 38         
 39         DBHelper helper = new DBHelper(this);
 40         isSaveInDb = helper.checkIfSave(mAppWidgetId);
 41         if(!isSaveInDb){//没有保存到数据库
 42             Log.i(TAG, "not in db");
 43         }
 44         
 45         content = helper.getText(mAppWidgetId);
 46         oldColor = helper.getColor(mAppWidgetId);
 47         setBgColor(mLLContent, oldColor);
 48         helper.close();
 49 
 50         Log.i(TAG, "mAppWidgetId = " + mAppWidgetId + ",hasindb = " + hasindb + ",text = " + content);
 51         mEditText.setText(content);
 52         // 定位光标位置
 53         int selection_end = (mEditText.getText().toString()).length();
 54         mEditText.setSelection(selection_end);
 55         
 56         if (mAppWidgetId == -1) {
 57             setResult(Activity.RESULT_CANCELED);
 58             finish();
 59         }
 60         
 61         if(hasindb == false){
 62             DBHelper helper1 = new DBHelper(this);
 63             if (helper1.insertNote(mAppWidgetId, (mEditText.length() > 0?mEditText.getText().toString():""),0,hasindb)) {
 64                 // Push newly updated widget to surface
 65                 RemoteViews views = MiniWidgetProvider.updateWidget(this,
 66                         mAppWidgetId, helper1);
 67                 AppWidgetManager appWidgetManager = AppWidgetManager
 68                         .getInstance(this);
 69                 appWidgetManager.updateAppWidget(new int[] { mAppWidgetId }, views);
 70             }
 71             helper1.close();
 72 
 73             // Make sure we pass back the original mAppWidgetId
 74             Intent resultValue = new Intent();
 75             resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
 76             setResult(RESULT_OK, resultValue);
 77             finish();
 78         }
 79         super.onCreate(savedInstanceState);
 80     }
 81     
 82     @Override
 83     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 84         super.onActivityResult(requestCode, resultCode, data);
 85     }
 86 
 87     @Override
 88     public void onClick(View v) {
 89         switch ((Integer) v.getId()) {
 90         case  R.id.save:
 91             Log.i(TAG, "onClick  to save------------mAppWidgetId= " + mAppWidgetId + ",text = " + mEditText.getText().toString() );
 92             int color;
 93             if(newColor != -1){
 94                 color = newColor;
 95             }else{
 96                 color = oldColor;
 97             }
 98             DBHelper helper = new DBHelper(this);
 99             if (helper.insertNote(mAppWidgetId, (mEditText.length() > 0?mEditText.getText().toString():""),color,hasindb)) {
100                 Log.i(TAG, "save success=====");
101                 
102                 // Push newly updated widget to surface
103                 RemoteViews views = MiniWidgetProvider.updateWidget(this,
104                         mAppWidgetId, helper);
105                 AppWidgetManager appWidgetManager = AppWidgetManager
106                         .getInstance(this);
107                 appWidgetManager.updateAppWidget(new int[] { mAppWidgetId }, views);
108             }
109             helper.close();
110 
111             // Make sure we pass back the original mAppWidgetId
112             Intent resultValue = new Intent();
113             resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
114             setResult(RESULT_OK, resultValue);
115             finish();
116             
117             break;
118         case R.id.cancel :
119             Intent resultValue1 = new Intent();
120             resultValue1.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
121             setResult(RESULT_OK, resultValue1);
122             finish();
123             break;
124         default:
125             break;
126         }
127     }
128 …………………………
129 }