Android ContentProvider

public class MyContentProvide extends ContentProvider {

private SQLiteDatabase db;
private UriMatcher uriMatcher;

@Override
public boolean onCreate() {
DbHelper dbHelper = new DbHelper(getContext());
db = dbHelper.getWritableDatabase();
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
//增加uri
uriMatcher.addURI("com.zking.mycontentprovide","person",1);
uriMatcher.addURI("com.zking.mycontentprovide","person/#",2);
return false;
}

@Nullable
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
//匹配
int type = uriMatcher.match(uri);
switch (type){
case 1:
return db.query(false,"person",projection,selection,selectionArgs,null,null,sortOrder,null);
case 2:
long id = ContentUris.parseId(uri);
return db.query(false,"person",projection,"_id=?",new String[]{id + ""},null,null,sortOrder,null);
}
return null;
}

@Nullable
@Override
public String getType(Uri uri) {
return null;
}

@Nullable
@Override
public Uri insert(Uri uri, ContentValues values) {
db.insert("person",null,values);
return uri;
}

@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
return db.delete("person",selection,selectionArgs);
}

@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
return db.update("person",values,selection,selectionArgs);
}
}

4.创建一个应用程序作为Resolver

public class MainActivity extends AppCompatActivity {private String contentUrl = "content://com.zking.mycontentprovide";private ContentResolver cr;private ListView lv_main_list;private List<Pers4000on> persons = new ArrayList<>();private MyAdapter myAdapter;private PopupWindow popupWindow;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);cr = getContentResolver();initViews();}private void initViews() {lv_main_list = (ListView) findViewById(R.id.lv_main_list);persons = getPersons(null);myAdapter = new MyAdapter();lv_main_list.setAdapter(myAdapter);lv_main_list.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {@Overridepublic boolean onItemLongClick(AdapterView<?> parent, View view, final int position, final long id) {LinearLayout ll = new LinearLayout(MainActivity.this);ll.setOrientation(LinearLayout.VERTICAL);ll.setBackgroundColor(Color.argb(255,255,255,255));TextView tv_edit = new TextViewUtil(MainActivity.this).setText("编辑").toTextView();TextView tv_delete = new TextViewUtil(MainActivity.this).setText("删除").toTextView();ll.addView(tv_edit);tv_edit.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {final Person person = persons.get(position);LinearLayout linearLayout = new LinearLayout(MainActivity.this);linearLayout.setOrientation(LinearLayout.VERTICAL);final EditText et_id = new EditTextUtil(MainActivity.this,LinearLayout.LayoutParams.class,EditTextUtil.WIDTH_MATH_AND_HEGTI_WRAP).setText(person.getId()+ "").setHint("用户id").toEditText();et_id.setEnabled(false);final EditText et_name = new EditTextUtil(MainActivity.this,LinearLayout.LayoutParams.class,EditTextUtil.WIDTH_MATH_AND_HEGTI_WRAP).setText(person.getName()+ "").setHint("用户姓名").toEditText();final EditText et_age = new EditTextUtil(MainActivity.this,LinearLayout.LayoutParams.class,EditTextUtil.WIDTH_MATH_AND_HEGTI_WRAP).setText(person.getAge()+ "").setHint("用户年龄").toEditText();linearLayout.addView(et_id);linearLayout.addView(et_name);linearLayout.addView(et_age);AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);builder.setMessage("修改");builder.setView(linearLayout);builder.setNeutralButton("修改", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {ContentValues contentValues = new ContentValues();contentValues.put("name",et_name.getText().toString());contentValues.put("age",et_age.getText().toString());cr.update(Uri.parse(contentUrl),contentValues,"_id=?",new String[]{et_id.getText().toString()});persons = getPersons(null);myAdapter.notifyDataSetChanged();}});builder.setPositiveButton("取消",null);builder.show();popupWindow.dismiss();}});ll.addView(tv_delete);tv_delete.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);builder.setTitle("删除");builder.setMessage("你确定删除吗");builder.setNegativeButton("是", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {cr.delete(Uri.parse(contentUrl),"_id=?",new String[]{persons.get(position).getId() + ""});persons = getPersons(null);myAdapter.notifyDataSetChanged();}});builder.setPositiveButton("否",null);builder.show();popupWindow.dismiss();}});popupWindow = new PopupWindow(ll,300,300);popupWindow.setBackgroundDrawable(new ColorDrawable(Color.argb(0,255,255,255)));popupWindow.setBackgroundDrawable(new ColorDrawable(0x00000000));popupWindow.setOutsideTouchable(false);popupWindow.setFocusable(true);popupWindow.showAsDropDown(view);return false;}});}public List<Person> getPersons(String id){List<Person> persons = new ArrayList<>();Uri uri = null;if (id != null){uri =  Uri.parse(contentUrl + "/person/" + id);}else {uri =  Uri.parse(contentUrl + "/person");}Cursor cursor =  cr.query(uri,null,null,null[/b],null);while (cursor.moveToNext()){Person p = new Person();p.setId(cursor.getInt(0));p.setName(cursor.getString(1));p.setAge(cursor.getInt(2));persons.add(p);}return persons;}private class MyAdapter extends BaseAdapter{@Overridepublic int getCount() {return persons.size();}@Overridepublic Object getItem(int position) {return persons.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {LinearLayout linearLayout = new LinearLayout(MainActivity.this);Person person = persons.get(position);TextView textView = getTextView();textView.setText(person.getId() + "");TextView textView1 = getTextView();textView1.setText(person.getName() + "");TextView textView2 = getTextView();textView2.setText(person.getAge() + "");linearLayout.addView(textView);linearLayout.addView(textView1);linearLayout.addView(textView2);return linearLayout;}private TextView getTextView(){TextView textView = new TextView(MainActivity.this);LinearLayout.LayoutParams l = new LinearLayout.LayoutParams(0,LinearLayout.LayoutParams.WRAP_CONTENT);l.weight = 1;textView.setLayoutParams(l);return textView;}}public void query(View view){LinearLayout linearLayout = new LinearLayout(this);LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT);final EditText editText = new EditText(this);editText.setLayoutParams(lp);editText.setHint("请输入id");linearLayout.addView(editText);AlertDialog.Builder builder = new AlertDialog.Builder(this);builder.setMessage("查询");builder.setView(linearLayout);builder.setNeutralButton("查询", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {if (!TextUtils.isEmpty(editText.getText().toString())){persons = getPersons(editText.getText().toString());}else {persons = getPersons(null);}myAdapter.notifyDataSetChanged();}});builder.setPositiveButton("取消",null);builder.show();}public void insert(View view){LinearLayout linearLayout = new LinearLayout(this);linearLayout.setOrientation(LinearLayout.VERTICAL);final EditText et_name = new EditTextUtil(this,LinearLayout.LayoutParams.class,EditTextUtil.WIDTH_MATH_AND_HEGTI_WRAP).setHint("请输入用户名").toEditText();final EditText et_age = new EditTextUtil(this,LinearLayout.LayoutParams.class,EditTextUtil.WIDTH_MATH_AND_HEGTI_WRAP).setHint("请输入年龄").toEditText();et_age.setInputType(InputType.TYPE_CLASS_NUMBER);linearLayout.addView(et_name);linearLayout.addView(et_age);AlertDialog.Builder builder = new AlertDialog.Builder(this);builder.setMessage("增加");builder.setView(linearLayout);builder.setNeutralButton("添加", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {ContentValues contentValues = new ContentValues();contentValues.put("name",et_name.getText().toString());contentValues.put("age",et_age.getText().toString());cr.insert(Uri.parse(contentUrl),contentValues);persons = getPersons(null);myAdapter.notifyDataSetChanged();}});builder.setPositiveButton("取消",null);builder.show();}}