開關功能執行幾種情況

Question

嗨，我已經遇到了一段時間了，我似乎找不到解決方法。 我有一個包含三個項目的gridview，並且每個項目在被選中時都會打開一個活動。 問題出在我選擇case 0它首先打開了intent i然后打開了intent ii ，最后打開了intent iii 。

如果選擇case 1 ，則首先打開intent ii ，然后打開intent iii 。 最后，如果我選擇case 2 ，則打開intent iii 。 這是主要代碼！

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mItems = new ArrayList<GridViewItem>();
        Resources resources = getResources();

        mItems.add(new GridViewItem(resources.getDrawable(R.drawable.truck_package), getString(R.string.drop_package)));
        mItems.add(new GridViewItem(resources.getDrawable(R.drawable.man_package), getString(R.string.pick_package)));
        mItems.add(new GridViewItem(resources.getDrawable(R.drawable.register), getString(R.string.register)));
        mAdapter = new GridViewAdapter(this, mItems);
        // initialize the GridView
        final GridView gridView = (GridView) this.findViewById(R.id.gridView);
        gridView.setAdapter(mAdapter);
        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                switch (position){
                    case 0 :
                        Intent i = new Intent(getApplicationContext(), DropPackage.class);
                        Toast.makeText(getApplicationContext(), "DropPack", Toast.LENGTH_SHORT).show();
                        startActivity(i);

                    case 1 :
                        Intent ii = new Intent(getApplicationContext(), PickPackage.class);
                        Toast.makeText(getApplicationContext(), "PickPack", Toast.LENGTH_SHORT).show();
                        startActivity(ii);
                    case 2 :
                        Intent iii = new Intent(getApplicationContext(), Register.class);
                        Toast.makeText(getApplicationContext(), "Register", Toast.LENGTH_SHORT).show();
                        startActivity(iii);
                }



            }
        });
    }

知道可能是什么問題嗎？ 謝謝 ：）

Answer 1

您沒有在case語句的末尾放置break 。 嘗試在每個case語句的末尾添加break。

試試這個

switch (position){
    case 0 :
        Intent i = new Intent(getApplicationContext(), DropPackage.class);
        Toast.makeText(getApplicationContext(), "DropPack", Toast.LENGTH_SHORT).show();
        startActivity(i);
        break;

    case 1 :
        Intent ii = new Intent(getApplicationContext(), PickPackage.class);
        Toast.makeText(getApplicationContext(), "PickPack", Toast.LENGTH_SHORT).show();
        startActivity(ii);
        break;

    case 2 :
        Intent iii = new Intent(getApplicationContext(), Register.class);
        Toast.makeText(getApplicationContext(), "Register", Toast.LENGTH_SHORT).show();
        startActivity(iii);
        break;
}