1.listview入门,自定义的数据适配器 <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" tools:context=".ListViewActivity" > <ListView android:id="@+id/lv" android:layout_width="match_parent" android:layout_height="match_parent" > </ListView> </RelativeLayout> public class ListViewActivity extends Activity { private ListView lv; public String tag = "ListViewActivity"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_list_view); lv = (ListView) findViewById(R.id.lv); lv.setAdapter(new MyAdapter()); } /** * 自定义的数据适配器 * * @author Administrator * */ private class MyAdapter extends BaseAdapter { /** * 控制listview里面有多个条目. */ @Override public int getCount() { return 15; } /** * 返回每个位置对应的view对象 */ @Override public View getView(int position, View convertView, ViewGroup parent) { // 这个方法被调用了多少次? Log.i(tag, "POSITION:" + position); TextView tv = new TextView(ListViewActivity.this); tv.setTextSize(30); tv.setTextColor(Color.RED); tv.setText("我是第" + position + "个条目"); return tv; } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } } } 2.采用layoutInflater打气筒创建一个view对象 在上面的基础上添加list_item.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="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/tv_name" android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="#000000" /> <TextView android:id="@+id/tv_number" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout> /** * 返回每个位置对应的view对象 */ @Override public View getView(int position, View convertView, ViewGroup parent) { // 这个方法被调用了多少次? Log.i(tag, "POSITION:" + position); View view = View.inflate(getApplicationContext(), R.layout.list_item, null); TextView tv_name = (TextView) view.findViewById(R.id.tv_name); TextView tv_number = (TextView) view.findViewById(R.id.tv_number); tv_name.setText("name:"+position); tv_number.setText(position+""); return view; } 3.常用数据适配器ArrayAdapter protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_list_view); lv = (ListView) findViewById(R.id.lv); lv.setAdapter(new ArrayAdapter<String>(this, R.layout.list_item, R.id.tv_name, new String[] { "aaaa", "bbbb", "cccc", "ddddd" })); } 4.常用数据适配器SimpleAdapter protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_list_view); lv = (ListView) findViewById(R.id.lv); List<Map<String, String>> data = new ArrayList<Map<String, String>>(); Map<String, String> item1 = new HashMap<String, String>(); item1.put("name", "zhangsna"); item1.put("number", "124245"); Map<String, String> item2 = new HashMap<String, String>(); item2.put("name", "lisi"); item2.put("number", "4545"); data.add(item1); data.add(item2); lv.setAdapter(new SimpleAdapter(this, data, R.layout.list_item, new String[] { "name", "number" }, new int[] { R.id.tv_name, R.id.tv_number })); } 5.使用ContentProvider（内容提供者）共享数据 ContentProvider 在android中的作用是对外共享数据，也就是说你可以通过ContentProvider把应用中的数据共享给其他应用访问，其他应用可以通过ContentProvider 对你应用中的数据进行添删改查。 如果采用文件操作模式对外共享数据，数据的访问方式会因数据存储的方式而不同，导致数据的访问方式无法统一 使用ContentProvider对外共享数据的好处是统一了数据的访问方式。 定义一个类继承ContentProvider类 package com.itheima.contentprovider; import android.content.ContentProvider; import android.content.ContentUris; import android.content.ContentValues; import android.content.UriMatcher; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.net.Uri; import com.example.demo1.db.PersonSQLiteOpenHelper; public class PersonProvider extends ContentProvider { // 定义一个uri匹配器，用于匹配uri，如果匹配不成功返回-1 private static UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH); private static final int INSERT = 1; private static final int DELETE = 2; private static final int UPDATE = 3; private static final int QUERY = 4; private static final int QUERYONE = 5; private static final Uri URI = Uri.parse("content://person.db"); private PersonSQLiteOpenHelper helper; static { // 添加一组匹配规则 // authority: the authority to match // path: the path to match. * may be used as a wild card for any text, // and # may be used as a wild card for numbers. // code: the code that is returned when a URI is matched against the // given components. Must be positive. matcher.addURI("com.itheima.contentprovider.personprovider", "insert", INSERT); matcher.addURI("com.itheima.contentprovider.personprovider", "delete", DELETE); matcher.addURI("com.itheima.contentprovider.personprovider", "update", UPDATE); matcher.addURI("com.itheima.contentprovider.personprovider", "query", QUERY); matcher.addURI("com.itheima.contentprovider.personprovider", "query/#", QUERYONE); } @Override public boolean onCreate() { this.helper = new PersonSQLiteOpenHelper(getContext()); return false; } @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { if (matcher.match(uri) == QUERY) { SQLiteDatabase db = helper.getReadableDatabase(); Cursor cursor = db.query("person", projection, selection, selectionArgs, null, null, sortOrder); // 注意这里的db和cursor不能关闭 return cursor; } else if (matcher.match(uri) == QUERYONE) { SQLiteDatabase db = helper.getReadableDatabase(); long id = ContentUris.parseId(uri); Cursor cursor = db.query("person", projection, "id=?", new String[] { id + "" }, null, null, sortOrder); // 注意这里的db和cursor不能关闭 return cursor; } else { throw new IllegalArgumentException("非法uri"); } } @Override public int delete(Uri uri, String selection, String[] selectionArgs) { if (matcher.match(uri) == DELETE) { SQLiteDatabase db = helper.getWritableDatabase(); // 注册内容观测者 getContext().getContentResolver().notifyChange(URI, null); return db.delete("person", selection, selectionArgs); } else { throw new IllegalArgumentException("非法uri"); } } @Override public Uri insert(Uri uri, ContentValues values) { if (matcher.match(uri) == INSERT) { SQLiteDatabase db = helper.getWritableDatabase(); long id = db.insert("person", null, values); getContext().getContentResolver().notifyChange(URI, null); // 返回指定的Uri路劲对象 // content://cn.itcast.provider.custom.usersprovider/users/1 return ContentUris.withAppendedId(uri, id); } else { throw new IllegalArgumentException("非法uri"); } } @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { if (matcher.match(uri) == UPDATE) { SQLiteDatabase db = helper.getWritableDatabase(); getContext().getContentResolver().notifyChange(URI, null); return db.update("person", values, selection, selectionArgs); } else { throw new IllegalArgumentException("非法uri"); } } /** * Implement this to handle requests for the MIME type of the data at the * given URI. The returned MIME type should start with * vnd.android.cursor.item for a single record, or vnd.android.cursor.dir/ * for multiple items. This method can be called from multiple threads, as * described in Processes and Threads. */ @Override public String getType(Uri uri) { if (matcher.match(uri) == QUERY) { return "vnd.android.cursor.dir/person"; } else if (matcher.match(uri) == QUERYONE) { return "vnd.android.cursor.item/person"; } else { return ""; } } } 定义一个类继承SQLiteOpenHelper类 package com.example.demo1.db; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; public class PersonSQLiteOpenHelper extends SQLiteOpenHelper { private static final String DBFILENAME = "person.db"; private static int db_version = 1; public PersonSQLiteOpenHelper(Context context) { super(context, DBFILENAME, null, db_version); } /** * 当数据库第一次创建时调用 */ @Override public void onCreate(SQLiteDatabase db) { String sql = "create table person(id integer primary key autoincrement,name varchar(20),number varchar(20))"; db.execSQL(sql); } /** * 当数据库的版本号发生增加的时候调用 */ @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { System.out.println("数据库更改！"); String sql = "alter table person add account varchar(20)"; db.execSQL(sql); } } 清单文件中注册内容提供者 <provider android:name="com.itheima.contentprovider.PersonProvider" android:authorities="com.itheima.contentprovider.personprovider" ></provider> 第三方软件 public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void getAll(View view) { ContentResolver resolver = this.getContentResolver(); Uri uri = Uri .parse("content://com.itheima.contentprovider.personprovider/query"); Cursor cursor = resolver.query(uri, null, null, null, null); StringBuffer sb = new StringBuffer(); while (cursor.moveToNext()) { sb.append(cursor.getString(cursor.getColumnIndex("name")) + " -- " + cursor.getString(cursor.getColumnIndex("number"))); sb.append("\n"); } TextView tv_info = (TextView) this.findViewById(R.id.tv_info); tv_info.setText(sb.toString()); cursor.close(); } public void getOne(View view) { ContentResolver resolver = this.getContentResolver(); // Uri uri = Uri // .parse("content://com.itheima.contentprovider.personprovider/query"); // Cursor cursor = resolver.query(uri, null, "id=?",new String[]{"1"} , // null); Uri uri = Uri.parse("content://com.itheima.contentprovider.personprovider/query/1"); Cursor cursor = resolver.query(uri, null, null, null, null); StringBuffer sb = new StringBuffer(); if (cursor.moveToFirst()) { sb.append(cursor.getString(cursor.getColumnIndex("name")) + " -- " + cursor.getString(cursor.getColumnIndex("number"))); sb.append("\n"); } TextView tv_info = (TextView) this.findViewById(R.id.tv_info); tv_info.setText(sb.toString()); cursor.close(); } public void insert(View view) { ContentResolver resolver = this.getContentResolver(); Uri uri = Uri.parse("content://com.itheima.contentprovider.personprovider/insert"); ContentValues values = new ContentValues(); values.put("name", "reality"); values.put("number", "567"); Uri result = resolver.insert(uri, values); System.out.println("result = " + result); } public void update(View view) { ContentResolver resolver = this.getContentResolver(); Uri uri = Uri .parse("content://com.itheima.contentprovider.personprovider/update"); ContentValues values = new ContentValues(); values.put("name", "dog"); values.put("number", "110"); int result = resolver.update(uri, values, "id=?", new String[] { "1" }); System.out.println("result = " + result); } public void delete(View view) { ContentResolver resolver = this.getContentResolver(); Uri uri = Uri .parse("content://com.itheima.contentprovider.personprovider/delete"); int result = resolver.delete(uri, "id=?", new String[] { "3" }); System.out.println("result = " + result); } } 6.短信的备份 public class BackupsmsActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_backupsms); } public void backupSMS(View view) { Uri uri = Uri.parse("content://sms"); ContentResolver resolver = this.getContentResolver(); Cursor cursor = resolver.query(uri, new String[] { "date", "body",
"address", "type" }, null, null, null); ArrayList<SmsInfo> infos = new ArrayList<SmsInfo>(); while (cursor.moveToNext()) { long date = cursor.getLong(0); String body = cursor.getString(1); String address = cursor.getString(2); int type = cursor.getInt(3); SmsInfo smsInfo = new SmsInfo(date, body, address, type); infos.add(smsInfo); } SmsUtil.save(this, infos); } } public class SmsUtil { public static void save(Context context, ArrayList<SmsInfo> infos) { XmlSerializer xmlSerializer = Xml.newSerializer(); File file = new File(Environment.getExternalStorageDirectory(),
"sms_bak.xml");//mnt/sdcard/sms_bak.xml
try { FileOutputStream fos = new FileOutputStream(file); xmlSerializer.setOutput(fos, "utf-8"); xmlSerializer.startDocument("utf-8", true); xmlSerializer.startTag(null, "smss"); for (SmsInfo info : infos) { xmlSerializer.startTag(null, "sms"); xmlSerializer.attribute(null, "type", info.getType() + ""); xmlSerializer.startTag(null, "date"); xmlSerializer.text(info.getDate() + ""); xmlSerializer.endTag(null, "date"); xmlSerializer.startTag(null, "address"); xmlSerializer.text(info.getAddress()); xmlSerializer.endTag(null, "address"); xmlSerializer.startTag(null, "body"); xmlSerializer.text(info.getBody()); xmlSerializer.endTag(null, "body"); xmlSerializer.endTag(null, "sms"); } xmlSerializer.endTag(null, "smss"); xmlSerializer.endDocument(); fos.close(); Toast.makeText(context, "保存成功", 0).show(); } catch (Exception e) { e.printStackTrace(); Toast.makeText(context, "保存失败", 0).show(); } } } public class SmsInfo { private int id; private long date; private String body; private String address; private int type; public SmsInfo() { super(); // TODO Auto-generated constructor stub } public SmsInfo(int id, long date, String body, String address) { super(); this.id = id; this.date = date; this.body = body; this.address = address; } public SmsInfo(long date, String body, String address, int type) { super(); this.date = date; this.body = body; this.address = address; this.type = type; } public int getType() { return type; } public void setType(int type) { this.type = type; } public int getId() { return id; } public void setId(int id) { this.id = id; } public long getDate() { return date; } public void setDate(long date) { this.date = date; } public String getBody() { return body; } public void setBody(String body) { this.body = body; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } } 7.插入一条记录到系统短信应用 public class InsertsmsActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_insertsms); new Thread() { public void run() { try { Thread.sleep(10000); Uri uri = Uri.parse("content://sms"); ContentResolver resolver = getContentResolver(); ContentValues values = new ContentValues(); values.put("address", "10086"); values.put("type", 1); values.put("date", System.currentTimeMillis()); values.put("body", "您的余额还有100,000,000元！"); resolver.insert(uri, values); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }.start(); } } <uses-permission android:name="android.permission.READ_SMS" /> <uses-permission android:name="android.permission.WRITE_SMS" />
