Question

我已经看到许多有关此问题的问题和答案。我几乎尝试了所有方法，但没有一个答案对我没有用。

我正在使用运行Android 8.0.0（API 26）的Samsung S9手机。

如果我尝试以下代码，则会调用setOnItemClickListener。

    mListView = (ListView) findViewById(R.id.azure_photo_list);
    mListView.setDividerHeight(1);
    registerForContextMenu(mListView);
    // ListView Item Click Listener
    mListView.setOnItemClickListener((parent, view, position, id) -> {
        Intent intent = new Intent(getBaseContext(), AzureImageActivity.class);
        intent.putExtra("image", images[position]);
        startActivity(intent);

    }); 

   String[] images = ImageManager.ListImages();
   ArrayAdapter<String> adapter = new ArrayAdapter<String>(AzurePhotoList.this,
                            android.R.layout.simple_list_item_1, android.R.id.text1, images);
   mListView.setAdapter(adapter);

请注意，布局来自Android系统，文本视图来自Android系统。如果我提供自己的布局，如下所示：-

String[] images = ImageManager.ListImages();
ArrayAdapter<String> adapter = new ArrayAdapter<String>(AzurePhotoList.this,                         
R.layout.content_azure_photo_list,R.id.azure_list_item_name, images);

然后不再调用setOnItemClickListener。怎么了？

Answer 1

我克隆了存储库，发现代码库中几乎没有问题。

要使点击侦听器正常工作，您至少必须更改以下内容：-

在xml（如下所述）中，您已使用ConstraintLayout，并且未对任何视图赋予约束。结果，每个视图都绘制为（0,0）。
Handler的实现不正确

为使您有一个良好的开端，请在代码中更改下面提到的2个文件，然后单击侦听器将始终起作用。

注意：我花了很少的时间编写代码，这不是可用于生产的代码。在下面给您要点和代码，以指明正确的方向。

AzurePhotoList

public class  AzurePhotoList extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {

private final static int MY_REQUEST_PERMISSIONS_READ_EXTERNAL_STORAGE = 102;
private String[] images;
private ListView mListView;
private Handler handler;
private String[] images_lists;

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

    handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
             images_lists = msg.getData().getStringArray("images_list");
 //                AzurePhotoList.this.images = images;
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(AzurePhotoList.this,
                R.layout.content_azure_photo_list, R.id.azure_list_item_name, images_lists);
                    /*ArrayAdapter<String> adapter = new ArrayAdapter<String>(AzurePhotoList.this,
                            R.layout.content_azure_photo_list,R.id.azure_list_item_name, images);*/
            mListView.setAdapter(adapter);
        }
    };

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.addDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);

    mListView = (ListView) findViewById(R.id.azure_photo_list);
    mListView.setDividerHeight(1);
    registerForContextMenu(mListView);

    // ListView Item Click Listener
    mListView.setOnItemClickListener((parent, view, position, id) -> {
        Intent intent = new Intent(AzurePhotoList.this.getBaseContext(), AzureImageActivity.class);
        intent.putExtra("image", images_lists[position]);
        AzurePhotoList.this.startActivity(intent);

    });

    loadImageFromAzure();
}

private void loadImageFromAzure(){
    Thread th = new Thread(new Runnable() {
        public void run() {
            try {
                final String[] images = ImageManager.ListImages();
                Bundle bundle = new Bundle();
                bundle.putStringArray("images_list", images);
                Message message = new Message();
                message.setData(bundle);
                handler.sendMessage(message);
            }
            catch(Exception ex) {
                final String exceptionMessage = ex.getMessage();
                handler.post(new Runnable() {
                    public void run() {
                        Toast.makeText(AzurePhotoList.this, exceptionMessage, Toast.LENGTH_SHORT).show();
                    }
                });
            }
        }});
    th.start();
}

//your remaining code...
//...

content_azure_photo_list.xml

<ListView
    android:id="@+id/azure_photo_list"
    android:scrollbars="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>



<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/azure_list_item_name"
        android:layout_width="wrap_content"
        android:layout_height="150dp"
        android:textAppearance="@android:style/TextAppearance.Medium" />

</LinearLayout>

Android ListView点击监听器不起作用

1 个答案: