Question

我有ListView使用customlistadapter的自定义适配器。如果点击了该项目或行，则会显示AlertDialog negative和positive按钮。现在我希望positive中的每个AlertDialog按钮启动不同的活动。

例如：如果我从列表/第一行的对话框中单击肯定按钮，它将显示Activity1，如果我在列表/第二行的对话框中单击肯定按钮，它将显示Activity2。

这是我的MenuList.java：

public class MenuList extends ActionBarActivity{

ListView list;
String[] itemname ={
        "RM. Kemang raya",
        "Granny's Nest",
        "RM. Dua Saudara",
        "Solaria Giant",
        "Rumah Kayu",
        "RM. Mbok Wito 2",
};

String[] itemdescription ={
        "[Umum]\nJl.Endro Suratmin Sukarame, Bandar Lampung.\nTelp.0721723732",
        "[Cafe]\nJl.P.Antasari Gg.P.Sebuku Sukarame, Bandar Lampung.\nTelp.0821 8619 8999",
        "[Masakan Padang]\nJl.P.Tirtayasa Sukabumi, Bandar Lampung.\nTelp.0721745627",
        "[Umum/Cafe]\nJl.P.Antasari Sukarame, Bandar Lampung.\nTelp.0721 773066",
        "[Umum]\nJl.Arief Rahman Hakim No. 45, Bandar Lampung.\nTelp.0721 700666",
        "[Umum]\nJl.Arief Rahman Hakim Blok A No.16, Bandar Lampung.\nTelp.0721 701298",
};

Integer[] imgid={
        R.drawable.ic_listrestro,
        R.drawable.ic_listrestro,
        R.drawable.ic_listrestro,
        R.drawable.ic_listrestro,
        R.drawable.ic_listrestro,
        R.drawable.ic_listrestro,
};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.menu_restoran);

    // enable up/back button
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    Button btn1 = (Button) findViewById(R.id.button1);
    btn1.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent intent = new Intent(MenuRestoran.this, MapsActivity.class);
            startActivity(intent);
        }
    });

    CustomListAdapter adapter=new CustomListAdapter(this, itemname, itemdescription, imgid);
    list=(ListView)findViewById(R.id.list);
    list.setAdapter(adapter);

    list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long id) {
            // TODO Auto-generated method stub
            String Slecteditem= itemname[+position];
            Toast.makeText(getApplicationContext(), Slecteditem, Toast.LENGTH_SHORT).show();

            //alert dialog
            AlertDialog.Builder adb = new AlertDialog.Builder(
                    MenuRestoran.this);
            adb.setTitle(itemname[+position]);
            adb.setMessage("Lihat Lokasi di Map?");
            adb.setIcon(imgid[+position]);
            adb.setPositiveButton("Lihat", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    Intent intent = new Intent(MenuRestoran.this, MapsRMKemang.class);
                    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(intent);
                }
            });
            adb.setNegativeButton("Batal", null);
            adb.show();

        }
    });
}

这是我的CustomListAdapter.java：

public class CustomListAdapter extends ArrayAdapter<String> {

private final Activity context;
private final String[] itemname;
private final String[] itemdescription;
private final Integer[] imgid;

public CustomListAdapter(Activity context, String[] itemname, String[] itemdescription, Integer[] imgid) {
    super(context, R.layout.list_view, itemname);
    // TODO Auto-generated constructor stub

    this.context=context;
    this.itemname=itemname;
    this.imgid=imgid;
    this.itemdescription = itemdescription;
}

public View getView(int position,View view,ViewGroup parent) {
    LayoutInflater inflater=context.getLayoutInflater();
    View rowView=inflater.inflate(R.layout.list_view, null, true);

    TextView txtTitle = (TextView) rowView.findViewById(R.id.item);
    ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
    TextView Descriptiontxt = (TextView) rowView.findViewById(R.id.textView1);

    txtTitle.setText(itemname[position]);
    Descriptiontxt.setText(itemdescription[position]);
    imageView.setImageResource(imgid[position]);
    return rowView;

};

你们可以告诉我这样做吗？感谢

Answer 1

在你的适配器中，

public class CustomListAdapter extends ArrayAdapter<String> {
    private ClickCallback clickCallback;

    public void setClickCallback(ClickCallback clickCallback) {
        this.clickCallback = clickCallback;
    }

getView

中的

rowView.setOnClickListener(new View.OnClickListner() {
    @Override
    public void onClick(View v) {
        if (clickCallback == null) {
            return;
        }
        clickCallback.invoke(position);
    }
};);

您可以在正面和负面按钮上附加听众。

此处clickCallback是您需要实现的自定义类来处理回调。

public interface ClickCallback {
    public void invoke(int position);
}

在您的活动中，

private class PositiveCallback implements ClickCallback {
    public void invoke(int position) {
        // call your activities
    }
}

 CustomListAdapter adapter=new CustomListAdapter(this, itemname, itemdescription, imgid);
 adapter.setClickCallback(new PositiveCallback());

Answer 2

您已拥有大部分代码，只需添加对position启动AlertDialog时点击的final int pos的检查。

您必须添加onClickListener()，以便可以在setPositiveButton()的内部list.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub String Slecteditem= itemname[+position]; Toast.makeText(getApplicationContext(), Slecteditem, Toast.LENGTH_SHORT).show(); final int pos = position; //added //alert dialog AlertDialog.Builder adb = new AlertDialog.Builder( MenuRestoran.this); adb.setTitle(itemname[+position]); adb.setMessage("Lihat Lokasi di Map?"); adb.setIcon(imgid[+position]); adb.setPositiveButton("Lihat", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //New Code below: if (pos == 0) { Intent intent = new Intent(MenuRestoran.this, Activity1.class); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent); } else if (pos == 1) { Intent intent = new Intent(MenuRestoran.this, Activity2.class); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent); } //end new code..... } }); adb.setNegativeButton("Batal", null); adb.show(); } });中访问它：

.destroy

如何为ListView项目单击事件中显示的对话框上的每个正面按钮启动不同的活动

2 个答案: