android 在一个应用中启动另一个应用android 在一个应用中启动另一个应用

        startDingAppButton = (Button) findViewById(R.id.start_ding_app_button);
        startDingAppButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                PackageInfo pi = null;
                try {
                    pi = packageManager.getPackageInfo("com.alibaba.android.rimet", 0);
                } catch (PackageManager.NameNotFoundException e) {

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

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

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

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

                    ComponentName cn = new ComponentName("com.alibaba.android.rimet", className);
                    intent.setComponent(cn);
                    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

                    Context context = getApplicationContext();
                    context.startActivity(intent);
                }

            }
        });

PackageManager packageManager = context.getPackageManager();
packageManager.getInstalledApplications(0);