Android使用ContentProvider实现查看系统短信功能

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".mainactivity">
    <textview
        android:id="@+id/tv_show"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:textsize="20dp"
        android:layout_weight="9"></textview>
    <button
        android:id="@+id/bt_show"
        android:layout_weight="1"
        android:text="查看短信"
        android:onclick="show"
        android:layout_width="match_parent"
        android:layout_height="0dp"></button>
</linearlayout>

public class sms {
    private int id;
    private string address;
    private string body;

    public sms(int id, string address, string body) {
        this.id = id;
        this.address = address;
        this.body = body;
    }

    public int getid() {
        return id;
    }

    public void setid(int id) {
        this.id = id;
    }

    public string getaddress() {
        return address;
    }

    public void setaddress(string address) {
        this.address = address;
    }

    public string getbody() {
        return body;
    }

    public void setbody(string body) {
        this.body = body;
    }
}

public class mainactivity extends appcompatactivity {
    private textview tv_show;
    private button bt_show;
    private list<sms> list=new arraylist<>();
    private string text="";

    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_main);
        tv_show=findviewbyid(r.id.tv_show);
        bt_show=findviewbyid(r.id.bt_show);
    }

    public void show(view view) {
        activitycompat.requestpermissions(mainactivity.this,new string[]{manifest.permission.read_sms},1);
        }
        public void getsms(){
             uri uri= uri.parse("content://sms/");
            contentresolver contentresolver=getcontentresolver();
            cursor cursor = contentresolver.query(uri, new string[]{"_id", "address",
                    "body"}, null, null, null);
            if (cursor!=null&&cursor.getcount()>0){
                if (list!=null){
                    list.clear();
                }
                text="";
                while (cursor.movetonext()){
                    int id=cursor.getint(0);
                    string name=cursor.getstring(1);
                    string body=cursor.getstring(2);
                    sms sms=new sms(id,name,body);
                    list.add(sms);
                }
                for (int i=0;i<list.size();i++){
                    text+="手机号码："+list.get(i).getaddress()+"\n";
                    text+="短信内容："+list.get(i).getbody()+"\n\n";
                }
                tv_show.settext(text);
            }
        }

    @override
    public void onrequestpermissionsresult(int requestcode, @nonnull string[] permissions, @nonnull int[] grantresults) {
        super.onrequestpermissionsresult(requestcode, permissions, grantresults);
        if (requestcode==1){
            for (int i=0;i<permissions.length;i++){
                if (grantresults[i]== packagemanager.permission_granted){
                    getsms();
                }else {
                    toast.maketext(mainactivity.this,"无权限",toast.length_short).show();
                }
            }
        }
    }


}