Android

在一个程序中进行某个操作时，打开另一个程序。

已知包名和启动界面的全类名

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
ComponentName cn = new ComponentName("org.venus.mpep", "org.venus.mpep.ui.activity.LoginActivity");
intent.setComponent(cn);
startActivity(intent);

其中"org.venus.mpep"是需要打开的应用程序的包名， "org.venus.mpep.ui.activity.LoginActivity"是需要打开应用程序的启动界面全类名

仅知道包名

try {
    pi = getActivity().getPackageManager().getPackageInfo("org.venus.mprs", 0);
    Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
    resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);
    resolveIntent.setPackage(pi.packageName);

    PackageManager pm = getActivity().getPackageManager();
    List<ResolveInfo> apps = pm.queryIntentActivities(resolveIntent, 0);

    ResolveInfo ri = apps.iterator().next();
    if (ri != null ) {
        String packageName = ri.activityInfo.packageName;
        String className = ri.activityInfo.name;

        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);

        ComponentName cn = new ComponentName(packageName, className);

        intent.setComponent(cn);
        startActivity(intent);
    }
} catch (PackageManager.NameNotFoundException e) {
    ToastUtil.show(getActivity(),"打开应用程序出错");
    e.printStackTrace();
}

其中"org.venus.mprs"是需打开的应用程序的包名

其实可以看出来2个方式是一样的操作，区别是一个指定启动界面，一个需要通过包名查询到启动界面再指定

因此可以把这个功能写成一个工具类，以后用的时候直接调用就行

package org.venus.library.utils;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;

import java.util.List;

/**
 * Author      Jxx          _让世界看到我
 * On          2021/12/3
 * Note        TODO
 */
public class PackagesUtil {

    /**
     * 打开一个app
     *
     * @param context
     * @param packageName
     * @param launcherActivityClass
     */
    public static void openApp(Context context, String packageName, String launcherActivityClass) {
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        ComponentName cn = new ComponentName(packageName, launcherActivityClass);
        intent.setComponent(cn);
        context.startActivity(intent);
    }

    /**
     * 打开一个app
     *
     * @param context
     * @param packageName
     */
    public static void openApp(Context context, String packageName) throws Exception {
        PackageInfo pi = context.getPackageManager().getPackageInfo(packageName, 0);
        PackageManager pm = context.getPackageManager();

        Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
        resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        resolveIntent.setPackage(pi.packageName);

        List<ResolveInfo> apps = pm.queryIntentActivities(resolveIntent, 0);

        ResolveInfo ri = apps.iterator().next();
        if (ri != null) {
            String thisPackageName = ri.activityInfo.packageName;
            String thisClassName = ri.activityInfo.name;

            Intent intent = new Intent(Intent.ACTION_MAIN);
            intent.addCategory(Intent.CATEGORY_LAUNCHER);

            ComponentName cn = new ComponentName(thisPackageName, thisClassName);

            intent.setComponent(cn);
            context.startActivity(intent);
        } else {
            throw new NullPointerException(packageName + "-没有找到对应的App");
        }
    }
}