Question

我知道如何通过使用intent向listview添加活动，你可以在下面的代码中看到我使用customadapter.java文件将back.class添加到mainactivity.java中。但是当我每次点击listview的每一行时它只打开一个活动（back.class）。现在我想使用intent为我的mainactivity.java添加不同的活动（leg.class，abs.class，chest.class等）所以当你点击listview的每一行时，它将打开不同的活动。我不知道怎么做？

这是我的mainactitvity.java文件

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        String[] excercise = {"Back DAY", "Legs DAY", "Abs DAY", "Chest DAY", "Shoulder DAY", "Arms DAY"};
        final int[] imgs = {R.drawable.back, R.drawable.leg, R.drawable.abs, R.drawable.chest, R.drawable.shoulder, R.drawable.arms};
        ListAdapter saruadapter = new customadapter(this, excercise, imgs);
        ListView sarulistview = (ListView) findViewById(R.id.sarelistview);
        sarulistview.setAdapter(saruadapter);

       // Intent intent = new Intent();
       // startService(intent);


        sarulistview.setOnItemClickListener(
                new android.widget.AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                      //  String excercise = String.valueOf(parent.getItemAtPosition(position));
                       // Toast.makeText(MainActivity.this, excercise, Toast.LENGTH_LONG).show();
                        Intent i = new Intent(MainActivity.this, back.class);
                        startActivity(i);
                    }
                }
        );
    }
}

这是我的customadapter.java文件

public class customadapter extends ArrayAdapter<String>{
    private int[] imgs;
    public customadapter(Context context, String[] excercise, int[] imgs) {
        super(context, R.layout.custom_row, excercise);
        this.imgs = imgs;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater saruinflator = LayoutInflater.from(getContext());
        View coustomView = saruinflator.inflate(R.layout.custom_row, parent, false);

        String excerciseitem = getItem(position);
        TextView saruview = (TextView) coustomView.findViewById(R.id.sareview);
        ImageView saruimg = (ImageView) coustomView.findViewById(R.id.sareimage);

        saruview.setText(excerciseitem);
        saruimg.setImageResource(imgs[position]);
        return coustomView;
    }
}

这是我的back.java文件

public class back extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bacon2);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        Bundle back = getIntent().getExtras();

        if(back == null)
        {
            return;
        }
    }
}

Answer 1

使用切换条件并使用位置打开新活动。

  sarulistview.setOnItemClickListener(
        new android.widget.AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
              //  String excercise = String.valueOf(parent.getItemAtPosition(position));
               // Toast.makeText(MainActivity.this, excercise, Toast.LENGTH_LONG).show();
       switch (position) {

        case 0:
            Intent i0 = new Intent(MainActivity.this, back.class);
            startActivity(i0);

            break;
        case 1:
            Intent i1 = new Intent(MainActivity.this, leg.class);
            startActivity(i1);
            break;
        case 2:
            Intent i2 = new Intent(MainActivity.this, abs.class);
            startActivity(i2);
            break;
        case 3:
            Intent i3 = new Intent(MainActivity.this, chest.class);
            startActivity(i3);
            break;

    }
            }
        }
);

Answer 2

当您将 onItemClick 设置为 ListView 时，您会获得所点击项目的位置。所以你需要根据你打开不同活动的需要进行某种类型的检查。一种可能的检查可以使用位置。例如： -

     sarulistview.setOnItemClickListener(
            new android.widget.AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    //  String excercise = String.valueOf(parent.getItemAtPosition(position));
                    // Toast.makeText(MainActivity.this, excercise, Toast.LENGTH_LONG).show();
                    if (position == 1) {
                        Intent i0 = new Intent(MainActivity.this, back.class);
                        startActivity(i0);
                    }
                    else if(position == 2){
                        Intent i1 = new Intent(MainActivity.this, chess.class);
                        startActivity(i1);
                    }else {
                        Intent i2 = new Intent(MainActivity.this, abc.class);
                        startActivity(i2); 
                    }
                }
            }
    );

这只是一个示例方法。业务逻辑将取决于您的需求。

如何为android中的listview中的每一行添加不同的活动

2 个答案: