android 项目编译但运行不正确

Question

这是我的主要 activity 文件：

package de.project.packagelist;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

import de.project.packagelist.models.Pkg;

public class MainActivity extends AppCompatActivity {

    public static MainActivity instance;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        instance = this;
        setContentView(R.layout.activity_main);

        populatePackages();
    }

    public void onPackageUninstalled(String pkgName) {
        Toast.makeText(this, pkgName + " is uninstalled", Toast.LENGTH_SHORT).show();
        populatePackages();
    }

    public void onPackageInstalled(String pkgName) {
        Toast.makeText(this, pkgName + " is installed", Toast.LENGTH_SHORT).show();
        populatePackages();
    }

    public void onPackageChanged(String pkgName) {
        Toast.makeText(this, pkgName + " is changed", Toast.LENGTH_SHORT).show();
        populatePackages();
    }

    public void populatePackages() {
        ArrayList<Pkg> pkgList = new ArrayList<>();
        PackageListAdapter packageListAdapter = new PackageListAdapter(this, pkgList);
        ListView listView = (ListView) findViewById(R.id.package_list);
        listView.setAdapter(packageListAdapter);
        pkgList.clear();
        PackageManager pm = getPackageManager();
        List<PackageInfo> packages = pm.getInstalledPackages(PackageManager.GET_META_DATA);

        for (PackageInfo packageInfo : packages) {
            pkgList.add(new Pkg(packageInfo.packageName, packageInfo.packageName, packageInfo.versionName, packageInfo.versionCode));
        }
    }

    class PackageListAdapter extends ArrayAdapter<Pkg> {

        public PackageListAdapter(Context context, List<Pkg> packages) {
            super(context, R.layout.list_item_package, packages);
        }

        @NonNull
        @Override
        public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
            View v = convertView;

            if (v == null) {
                LayoutInflater vi;
                vi = LayoutInflater.from(getContext());
                v = vi.inflate(R.layout.list_item_package, null);
            }
            final Pkg p = getItem(position);
            if (p != null) {
                TextView tt1 = (TextView)v.findViewById(R.id.pkg_label);
                tt1.setText(p.getLabel());
                TextView tt2 = (TextView)v.findViewById(R.id.pkg_name);
                tt2.setText(p.getName());
                TextView tt3 = (TextView)v.findViewById(R.id.pkg_version);
                tt3.setText(p.getVersionName());
                Button btn1 = (Button)v.findViewById(R.id.pkg_uninstall);
                btn1.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(getApplicationContext(), "Uninstalling package: " + p.getName(), Toast.LENGTH_SHORT).show();
                    }
                });

                Button btn2 = (Button)v.findViewById(R.id.pkg_launch);
                btn2.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(getApplicationContext(), "Launching package: " + p.getName(), Toast.LENGTH_SHORT).show();
                    }
                });

                ImageView imageView = (ImageView)v.findViewById(R.id.pkg_icon);
//                imageView.setImageDrawable(p.get);

            }

            return v;
        }
    }

}

这是接收者的代码：

import android.net.Uri;

import de.project.packagelist.MainActivity;


public class PackageChangedBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        //triggered whenever any change happens to any package
        //should inform activity
        Uri data = intent.getData();
        String pkgName = data.toString().substring(data.getScheme().length() + 1); //remove 'package:'
        if(MainActivity.instance != null) {
            if(intent.getAction() == "android.intent.action.PACKAGE_ADDED") {
                MainActivity.instance.onPackageInstalled(pkgName);
            } else if(intent.getAction() == "android.intent.action.PACKAGE_REMOVED") {
                MainActivity.instance.onPackageUninstalled(pkgName);
            } else if(intent.getAction() == "android.intent.action.PACKAGE_CHANGED") {
                MainActivity.instance.onPackageChanged(pkgName);
            }
        }
    }
}

我的代码编译没有错误，但是当我运行它时，启动时间太长并且按钮没有响应。我知道我使用的是旧版本和库，但是您看到我可以在我的代码中改进什么吗？在我的 XML 文件（清单和布局中，我有启动图标和 2 个按钮，一个用于启动程序包，另一个用于卸载它。

我做错了什么？

Answer 1

我认为您必须更改 populatePackages 函数。您创建适配器并在每个广播过程中一次又一次地设置列表视图。

我认为你应该创建一个 initAdapter

的函数

初始化适配器函数：

public void initAdapter(){
  //not set list here and PackageListAdapter define as global
  packageListAdapter = new PackageListAdapter(this);
  ListView listView = (ListView) findViewById(R.id.package_list);
  listView.setAdapter(packageListAdapter);
}

更改适配器的构造函数 class 并创建一个 setItems 函数

public PackageListAdapter(Context context) {
            super(context, R.layout.list_item_package);
        }
public setItems(List<Pkg> packages) {
  this.packages = packages
}

并在您的 populatePackages 函数中：

public void populatePackages() {
        ArrayList<Pkg> pkgList = new ArrayList<>();
        PackageManager pm = getPackageManager();
        List<PackageInfo> packages = pm.getInstalledPackages(PackageManager.GET_META_DATA);

        for (PackageInfo packageInfo : packages) {
            pkgList.add(new Pkg(packageInfo.packageName, packageInfo.packageName, packageInfo.versionName, packageInfo.versionCode));
        }
        packageListAdapter.setItems(pkgList); 
    }

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