从一个APP打开另一个APP ，提示 not exported from uid

Permission Denial: starting Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.qq.reader/.widget.picbrowser.PictureActivity } from ProcessRecord{3823559b 16851:com.pax.market.android.app/u0a322} (pid=16851, uid=10322) not exported from uid 10324

  public static void openApp(Activity activity,String packageName) {
PackageInfo pi;
try {
    pi = activity.getPackageManager().getPackageInfo(packageName, 0);
    Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
    resolveIntent.setPackage(pi.packageName);
    PackageManager pManager = activity.getPackageManager();
    List apps = pManager.queryIntentActivities(
            resolveIntent, 0);

    ResolveInfo ri = (ResolveInfo) apps.iterator().next();
    if (ri != null) {
        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);
        activity.startActivity(intent);
    }
} catch (NameNotFoundException e) {
    Log.e(TAG, "Package Name not found: " + e.getMessage() + ", App is not installed.");
} catch (SecurityException e){
    SnackBar.newBuilder().activity(activity).
            text(activity.getString(R.string.permission_denied_to_open))
            .build().show();
}

}

List apps = pManager.queryIntentActivities(resolveIntent, 0);查询出的符合条件的activity是有可能是多个的。
对于com.qq.reader来说可查询出两个：
com.qq.reader.widget.picbrowser.PictureActivity
com.qq.reader.activity.SplashActivity
其中PictureActivity是不能被启动的，因为它的exported=false,但是SplashActivity是可以启动的。
代码修改了一下，是可以启动qqreader的，是从SpalshActivity启动的。

public static void openApp(Activity activity,String packageName) {
PackageInfo pi;
try {
pi = activity.getPackageManager().getPackageInfo(packageName, 0);
Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
resolveIntent.setPackage(pi.packageName);
PackageManager pManager = activity.getPackageManager();
List apps = pManager.queryIntentActivities(
resolveIntent, 0);
for(ResolveInfo app: apps){

        Log.d(TAG,String.format("%s %s",app.activityInfo.packageName,app.activityInfo.name));
        packageName = app.activityInfo.packageName;
        String className = app.activityInfo.name;
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        ComponentName cn = new ComponentName(packageName, className);
        intent.setComponent(cn);
        try {
            activity.startActivity(intent);
        }catch(SecurityException e){
            e.printStackTrace();
        }
    }
  /*  ResolveInfo ri = (ResolveInfo) apps.iterator().next();
    if (ri != null) {
        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);
        activity.startActivity(intent);
    }*/
} catch (PackageManager.NameNotFoundException e) {
    Log.e(TAG, "Package Name not found: " + e.getMessage() + ", App is not installed.");
} catch (SecurityException e){
    SnackBar.newBuilder().activity(activity).
            text(activity.getString(R.string.permission_denied_to_open))
            .build().show();
}

}

意思是你的手机没有安装这个包名，这种情况应该跳转到你手机有的应用市场下载此应用

manifest.xml里面定义了同名的activity 造成程序不能启动。
这个Activity在Manifest文件里写了两份，去掉一份后，就可以正常运行了。

com.qq.reader/.widget.picbrowser.PictureActivity，确定这个activity是添加了android:exported="true"属性？，看提示是目标activity没设置exported

楼主在吗,我也遇到这样的问题,能不能给我个完整的例子看看,你这个openapp这个方法的参数填的是什么/