内容提供者 整体来说内容提供者就相当于别的应用提供了一个数据供你访问，比如访问短信，就是使用的内容提供者
public class readsms extends AppCompatActivity { private TextView textView; private Button sms; String text; Handler handler=new Handler(){ @Override public void handleMessage(@NonNull Message msg) { super.handleMessage(msg); textView.setText(((String)msg.obj)); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_readsms); textView = findViewById(R.id.smstext); sms = findViewById(R.id.sms); sms.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { read(); } }); } public void read() { Uri uri=Uri.parse("content://sms/"); ContentResolver resolver = getContentResolver(); Cursor cursor = resolver.query(uri, new String[]{"_id", "address", "type", "body", "date"}, null, null, null); List<smsinfo> smsinfos=new ArrayList<>(); if(cursor!=null && cursor.getCount()>0) { while (cursor.moveToNext()) { int id=cursor.getInt(0); String address=cursor.getString(1); int type=cursor.getInt(2); String body=cursor.getString(3); long date=cursor.getLong(4); smsinfo smsinfo=new smsinfo(id,address,type,body,date); smsinfos.add(smsinfo); } cursor.close(); } text="手机号码"+smsinfos.get(1).getAddress()+"\n"; text="短信内容"+smsinfos.get(1).getBody()+"\n"; Message message=new Message(); message.obj=text; handler.sendMessage(message); } }不难看出 1.先创建ContentResolver对象，同时指定Uri接口，注意是Uri不是Url
Uri uri=Uri.parse("content://sms/"); ContentResolver resolver = getContentResolver();短信提供了一个SQLlist数据库
Cursor cursor = resolver.query(uri, new String[]{"_id", "address", "type", "body", "date"}, null, null, null);因此这样接收但是别忘了，任何东西都要封装为一个对象
