ListView的点击事件

# item的点击事件

设置ListVie控件的监听item事件

ListView listview = findViewById(R.id.lv_main);
listview.setOnItemClickListener(this);
listview.setOnItemLongClickListener(this);

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item的点击事件

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(getApplicationContext(), mDataName[position], Toast.LENGTH_LONG).show();
        // 获得所点击行的数据
        AppInfo itemInfo = (AppInfo) parent.getItemAtPosition(position);
        itemInfo.setAppName("iqqcode");
        itemInfo.setAppSize(randSize(100));
        Log.i(TAG, "---------onItemClick: itemInfo" + itemInfo.toString());

        Intent intent = new Intent(MainActivity.this, SecondActivity.class);
        Bundle bundle = new Bundle();
        bundle.putParcelable("itemInfo", itemInfo);
        intent.putExtras(bundle);
        startActivity(intent);
    }

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item长按的点击事件

    @Override
    public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(getApplicationContext(), mDataName[position], Toast.LENGTH_LONG).show();
        // 获得所点击行的数据
        AppInfo itemInfo = (AppInfo) parent.getItemAtPosition(position);
        itemInfo.setAppName("iqqcode");
        itemInfo.setAppSize(randSize(100));
        Log.i(TAG, "---------onItemClick: itemInfo" + itemInfo.toString());

        Intent intent = new Intent(MainActivity.this, ThirdActivity.class);
        Bundle bundle = new Bundle();
        bundle.putParcelable("itemInfo", itemInfo);
        intent.putExtras(bundle);
        startActivity(intent);
        return true; // 消化该点击事件
    }

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# item上Button的点击事件(回调接口)

# 解决item点击反馈

问题：当点击某一行的时候，没有背景色的变化

原因：行中包含了按钮，Button的优先级较高，抢夺了焦点
解决方案：夺回焦点，在item布局的最外层标签设置descendantFocusability=blocksDescendants属性

# 设置Button的点击监听

首先定义点击监听的接口
Adapter中声明接口类型的引用
Adapter中设置item中Button的点击事件
Activity实现接口方法，并且设置点击事件

1. Adapter中定义接口

public interface IClickButton {
    void clickButton(int position);
}

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2. Adapter中声明引用

// 接口类型的引用
IClickButton clickItemButton;

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3. Adapter的getView方法设置点击事件

	// 设置Button的点击，提供在Activity中调用
	public void setClickButton(IClickButton clickItemButton) {
        this.clickItemButton = clickItemButton;
    }	

	@Override
    public View getView(int position, View convertView, ViewGroup parent) {

        // item中Button的点击事件
        Button btn = convertView.findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                clickItemButton.clickButton(position);
            }
        });

        // .....
    }

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4. Activity中调用setButton方法

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener, AdapterView.OnItemLongClickListener, IClickButton {

    private List<AppInfo> list;

    private AppInfo info;

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

        mListView = findViewById(R.id.list_view);
        MyBaseAdapter adapter = new MyBaseAdapter(this, list);
        adapter.setClickButton(this);
        mListView.setAdapter(adapter);

        mListView.setOnItemClickListener(this);
        mListView.setOnItemLongClickListener(this);
    }

    @Override
    public void clickButton(int position) {
        startActivity(new Intent(MainActivity.this, UninstallActivity.class));
    }
}

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编辑

上次更新: 2021/06/02, 10:01:48

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