基于Android 监听ContentProvider 中数据变化的相关介绍

public class PersonContentProvider extends ContentProvider[
 public Uri insert(Uri uri,ContentValues values){
  db.insert("person","personid",values);
  getContext().getContentResolver().notifyChange(uri,null);
 }//通知注册在此URI上的访问者，此外注册在insert方法上}

public class MainActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  Uri uri = Uri.parse("content://cn.wordtech.providers.personprovider/person");
  this.getContentResolver().registerContentObserver(uri, true, new PersonContentdObserver(new Handler()));
  // 第三个对象为监听对象，当数据发生改变的时候通知此对象做相应的改变
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

 private class PersonContentdObserver extends ContentObserver {

  public PersonContentdObserver(Handler handler) {
   super(handler);
  }

  @Override
  public void onChange(boolean selfChange) {
   Uri uri = Uri.parse("content://cn.wordtech.providers.personprovider/person");
   Cursor cursor = getContentResolver().query(uri, null, null, null,"personid desc limit 1");
   while (cursor.moveToNext()) {
    String name = cursor.getString(cursor.getColumnIndex("name"));
    Log.i("Name", name);
   }
   super.onChange(selfChange);
  }  }
}

Button btn = (Button) findViewById(R.id.btn);
  btn.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    Uri uri = Uri.parse("content://cn.wordtech.providers.personprovider/person");// 根据标识名得到内容提供者
    ContentResolver cr = MainActivity.this.getContentResolver();
    ContentValues values = new ContentValues();
    values.put("name", "Livingstone");
    values.put("phone", "1101");
    values.put("amount", "1111111111");
    cr.insert(uri, values);
   }
  });