Question

我正在创建一个待办事项列表，而当我运行我的应用程序时，它却无法运行，这会导致错误会话“ app”：安装失败。重新安装失败

“ cmd软件包install-create -r -t --full -S 2161096”返回错误“未知故障：cmd：找不到服务：软件包”

我已经尝试过将InstantRun转向。我尝试在其他设备上使用Progam

我的应用程序从一个基本的登录页面开始，在该页面中，您使用密码登录，如果密码正确，则将您带到Pag2.java（下面列出的代码）还有一个名为FileHelper.Java

的类

我从YouTube教程中编写了此代码。（https://www.youtube.com/watch?v=YmRPIGFftp0）

通常我不寻求帮助，但我无法找到答案请帮助。


import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Switch;
import android.widget.Toast;

import java.util.ArrayList;

public class Pag2 extends AppCompatActivity implements View.OnClickListener, AdapterView.OnItemClickListener {
    private EditText itemET;
    private Button btn;
    private ListView itemsList;


    private ArrayList<String> items;
    private ArrayAdapter<String> adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_pag2);

        itemET = findViewById(R.id.item_edit_text);
        btn = findViewById(R.id.add_btn);
        itemsList = findViewById(R.id.items_list);

        items = FileHelper.readData(this);

        adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, items);
        itemsList.setAdapter(adapter);
        FileHelper.writeData(items, this);

        btn.setOnClickListener(this);
        itemsList.setOnItemClickListener(this);


    }

    @Override
    public void onClick(View v) {
        switch(v.getId()) {
            case R.id.add_btn:

                String itemEntered = itemET.getText().toString();
                adapter.add(itemEntered);
                itemET.setText("");

                FileHelper.writeData(items, this);

                Toast.makeText(this, "Item Added", Toast.LENGTH_SHORT).show();

                break;
        }
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        items.remove(position);
        adapter.notify();
        Toast.makeText(this, "Delete", Toast.LENGTH_SHORT).show();
    }
}
//This Is FileHelper.java



package com.example.wetext;

import android.content.Context;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Array;
import java.util.ArrayList;

public class FileHelper {

    public static final String FILENAME ="listinfo.dat";

    public static void writeData(ArrayList<String> items, Context context){
        try {
            FileOutputStream fos = context.openFileOutput(FILENAME, Context.MODE_PRIVATE);
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(items);
            oos.close();
        }catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static ArrayList<String> readData(Context context){
        ArrayList<String> itemList = null;
        try {
            FileInputStream fis = context.openFileInput(FILENAME);
            ObjectInputStream ois = new ObjectInputStream(fis);
            itemList = (ArrayList<String>) ois.readObject();
        } catch (FileNotFoundException e) {

            itemList = new ArrayList<>();

            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return itemList;
    }

}

如何修复会话“ app”：安装失败。安装失败<a href:'rerun'>重新运行</rerun>

0 个答案: