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我是Android新手，并尝试执行以下任务：-我想打开Whatsapp联系人列表并获取选定的联系人数据。我能够完成一半的工作。Whatsapp联系人列表打开，但是一旦我按任何联系人，我的应用程序就会崩溃。这是我的代码：

要打开Whatsapp联系人列表：

btnChoose.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setPackage("com.whatsapp");
            try{
                Toast.makeText(AddScheduleActivity.this, "going out activity", Toast.LENGTH_SHORT).show();
                startActivityForResult(intent, 1);
                Toast.makeText(AddScheduleActivity.this, "getting In activity", Toast.LENGTH_SHORT).show();
            } catch (Exception e) {
                Toast.makeText(AddScheduleActivity.this, "Whatsapp not found", Toast.LENGTH_SHORT).show();  //no activity found to handle this intent means whatsapp is not installed
            }
        }
    });

获得选择：-

@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    super.onActivityResult(requestCode, resultCode, intent);
    Toast.makeText(AddScheduleActivity.this, "Ok In", Toast.LENGTH_SHORT).show();

    switch (requestCode) {
        case 1:
            if(resultCode == …