Question

（我正在使用android studio）问题是当我在真实设备上运行我的应用程序它是如此之慢，而在模拟器上它是相当快，我看到我必须在我的类上扩展asynctask或在代码的最慢部分创建一个新线程，但我新的，我不知道该怎么做，我试图创建新的线程，当用户点击按钮，但它没有工作，所以如果有人可以帮助我会欣赏它。这只是主要活动，因为id就像知道如何做到这一点，我会在理解之后更改其他类。

顺便说一句，在xml文件中我有3个按钮，1个listview，1个textview。

package com.wog.playerslist;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.content.Intent;

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.ListView;

import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

String itemName;
int itemPosition;
ArrayList<String> player = new ArrayList<>(4);
ArrayList<String> playersList = new ArrayList<>(50);
ArrayAdapter<String> playersAdapter;
ListView playersListView = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    playersListView = (ListView) findViewById(R.id.listViewPlayers);
    playersListView.setOnItemClickListener(new 
    AdapterView.OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            setItemName(playersListView.getItemAtPosition(position).toString());
            setItemPosition(position);
        }
    });
}

@Override
public void onResume() {
    super.onResume();

}

public void onButtonAddClicked(View view) {
    Intent intent = new Intent(this, PlayerAddActivity.class);
    startActivity(intent);

}

@Override
protected void onNewIntent(Intent intent) {
    if (intent != null)
        setIntent(intent);
    Bundle extras = this.getIntent().getExtras();
    if (extras != null) {
        if (extras.getString("Edit") != null) {
            playersList.remove(itemPosition);
            playersAdapter.notifyDataSetChanged();
        }
        String player;
        player = extras.getString("Nick") + " - " + extras.getString("Tag") + " - " + extras.getString("Vic") + " - " + extras.getString("Def");
        playersList.add(player);
        playersAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, playersList);
        playersListView.setAdapter(playersAdapter);
        playersAdapter.notifyDataSetChanged();
    }
}

public void onRemoveBtnClicked(View view) {
    if (itemName != null) {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);
        alertDialog.setTitle("Delete");
        alertDialog.setMessage("Delete " + itemName + "?");
        alertDialog.setNegativeButton("Cancel", null);
        alertDialog.setPositiveButton("Ok", new AlertDialog.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                playersList.remove(itemPosition);
                playersAdapter.notifyDataSetChanged();
                itemName = null;
                itemPosition = -1;
            }
        });
        alertDialog.show();
    } else {
        Toast toast = Toast.makeText(getApplicationContext(), "Please, select a player!", Toast.LENGTH_SHORT);
        toast.show();
    }
}

public void setItemName(String str) {
    this.itemName = str;
}

public void setItemPosition(int i) {
    this.itemPosition = i;
}

public void onEditButtonClicked(View view) {

    int i;
    int x = 0;
    int add = 0;
    Intent intent = new Intent(this, PlayerAddActivity.class);
    if (itemName != null) {
        while (add <= 2) {
            i = itemName.indexOf(" - ", x);
            player.add(add, itemName.substring(x, i));
            x = i + 3;
            add++;
        }
        player.add(add, itemName.substring(x, itemName.length()));

        intent.putExtra("Edit", "editView");
        intent.putExtra("Nick", player.get(0));
        intent.putExtra("Tag", player.get(1));
        intent.putExtra("Vic", player.get(2));
        intent.putExtra("Def", player.get(3));
        startActivity(intent);
    } else {
        Toast toast = Toast.makeText(getApplicationContext(), "Please, select a player!", Toast.LENGTH_SHORT);
        toast.show();
    }

}


}

Answer 1

根据设计，新的Android Emulator在大多数情况下比物理Android设备更快。慢度还取决于您使用的手机类型，外部库，以及最重要的编码技术。查看此YouTube链接以获取更多信息https://www.youtube.com/watch?v=fs0eira2pRY&feature=youtu.be&t=27m42s

Android应用程序在真实设备上非常慢

1 个答案: