从GridView启动活动

<GridView
    android:id="@+id/gridView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:numColumns="3"
    android:verticalSpacing="10dp"
    android:horizontalSpacing="10dp"
    android:padding="10dp"/>

public class MainActivity extends AppCompatActivity {
    private GridView gridView;
    private String[] items = {"Item 1", "Item 2", "Item 3", "Item 4", "Item 5"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        gridView = findViewById(R.id.gridView);
        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, items);
        gridView.setAdapter(adapter);

        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent = new Intent(MainActivity.this, SecondActivity.class);
                intent.putExtra("position", position);
                startActivity(intent);
            }
        });
    }
}

public class SecondActivity extends AppCompatActivity {
    private TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

        textView = findViewById(R.id.textView);

        Intent intent = getIntent();
        int position = intent.getIntExtra("position", -1);
        if (position != -1) {
            textView.setText("Clicked item position: " + position);
        }
    }
}