package com.example.uninstalldemo;

import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_CODE = 1;
    private static final String TAG = "MainActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button uninstallButton = findViewById(R.id.uninstall_button);
        uninstallButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                UninstallApk();
            }
        });
    }

    private void UninstallApk() {
        String packageName = getPackageName();
        Log.d(TAG, "UninstallApk: "+packageName);
        Uri packageURI = Uri.parse("package:" + packageName);
        Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);
        startActivityForResult(uninstallIntent,REQUEST_CODE);
    }

    @Override
    public void onActivityResult(int requestCode,int resultCode,Intent data){
        Log.d(TAG, "requestCode:" + String.valueOf(requestCode) + ", resultCode:" + String.valueOf(resultCode));
        switch (requestCode){
            case 1:
                if(resultCode == RESULT_OK){
                    Log.d(TAG, "onActivityResult: executed"); //点击确定，为什么打印此行？？
                }else{
                    Log.d(TAG, "onActivityResult: executed in here**");//点击取消，打印此行。
                }
                break;
            default:
                break;
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/uninstall_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Uninstall"/>

</LinearLayout>

<uses-permission android:name="android.permission.REQUEST_DELETE_PACKAGES"/>

2019-03-11 21:05:45.451 31622-31622/com.example.uninstalldemo D/MainActivity: UninstallApk: com.example.uninstalldemo
2019-03-11 21:05:48.827 31622-31622/com.example.uninstalldemo D/MainActivity: requestCode:1, resultCode:0
2019-03-11 21:05:48.827 31622-31622/com.example.uninstalldemo D/MainActivity: onActivityResult: executed in here**