ListView控件中item中实现的Button的点击事件

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1.适配器我们可以简单的理解为数据与控件之间交互的桥梁，如果我们想要实现在Listview控件之中实现Button的点击事件，就需要把当前的UI线程传进Adapter之中，因此要在Adapter之中设置监听器，即适配器中创建setOnClickListener方法，适配器中定义了ViewHolder静态类定义了button控件，此时需要ViewHolder类中创建setOnClickListener方法，将传进适配器的UI线程，传进ViewHolder类中，然后用button的监听器事件将UI线程传进去，如下图所示：

2.示例代码如下：

1）Listview的item中的布局文件需要设置：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:orientation="vertical"              android:layout_width="match_parent"              android:layout_height="match_parent"              android:descendantFocusability="blocksDescendants"        >    <TextView            android:id="@+id/item_cc_name"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            />    <Button            android:id="@+id/item_cc_del"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="删除"            /></LinearLayout>

2）这里由于需要将内容提供者中的数据加载到Listview中，我们自定义了CursorAdapter适配器。

/** * CursorAdapter 内部已经实现了 视图的复用，不需要再处理了 */public class MyDataAdapter extends CursorAdapter {    private View.OnClickListener mOnClickListener;    public MyDataAdapter(Context context, Cursor c, int flags) {        super(context, c, flags);    }    public void setOnClickListener(View.OnClickListener onClickListener) {        mOnClickListener = onClickListener;    }    @Override    public void bindView(View view, Context context, Cursor cursor) {        ViewHolder holder = (ViewHolder) view.getTag();        holder.bindView(cursor);    }    /**     * 创建布局     *     * @param context     * @param cursor     * @param parent     * @return     */    @Override    public View newView(Context context, Cursor cursor, ViewGroup parent) {        View ret = null;        ret = LayoutInflater.from(context).inflate(R.layout.item_cc, parent, false);        ViewHolder holder = new ViewHolder(ret);        holder.setOnClickListener(mOnClickListener);        ret.setTag(holder);        return ret;    }    private static class ViewHolder {        private TextView mTxtName;        private Button mBtnDel;        private View.OnClickListener mOnClickListener;        public ViewHolder(View itemView){            mTxtName = (TextView) itemView.findViewById(R.id.item_cc_name);            mBtnDel = (Button) itemView.findViewById(R.id.item_cc_del);        }        public void setOnClickListener(View.OnClickListener onClickListener) {            mOnClickListener = onClickListener;            mBtnDel.setOnClickListener(onClickListener);        }        public void bindView(Cursor cursor){            int index = cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);            String str = cursor.getString(index);            mTxtName.setText(str);            index = cursor.getColumnIndex(ContactsContract.Contacts._ID);            long id = cursor.getLong(index);            mBtnDel.setTag(id);        }    }}

3).UI线程的示例代码：

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener, AdapterView.OnItemLongClickListener, View.OnClickListener {    private MyDataAdapter mAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    private void initView() {        ListView listView = (ListView) findViewById(R.id.contact_list);        ContentResolver resolver = getContentResolver();        // 获取联系人列表，指定名称列        Cursor cursor = resolver.query(                ContactsContract.Contacts.CONTENT_URI,                new String[]{                        ContactsContract.Contacts._ID,  // _ID必须存在，显示在ListView时                        ContactsContract.Contacts.DISPLAY_NAME                },                null,                null,                null        );        //mAdapter = new SimpleCursorAdapter(        //        this,        //        R.layout.item_cc,        //        cursor,        //        new String[]{        //                ContactsContract.Contacts.DISPLAY_NAME        //        },        //        new int[]{R.id.item_cc_name},        //        CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER        //);        mAdapter = new MyDataAdapter(this, cursor, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);        //        mAdapter.setOnClickListener(this);        listView.setAdapter(mAdapter);        listView.setOnItemClickListener(this);        listView.setOnItemLongClickListener(this);    }    private void init() {        ContentResolver resolver = getContentResolver();        // 获取联系人列表，指定名称列        Cursor cursor = resolver.query(                ContactsContract.Contacts.CONTENT_URI,                new String[]{                        ContactsContract.Contacts.DISPLAY_NAME,                },                null,                null,                null        );        if (cursor != null) {            while (cursor.moveToNext()) {                int index = cursor.getColumnIndex(                        ContactsContract.Contacts.DISPLAY_NAME                );                if (index != -1) {                    String name = cursor.getString(index);                    Log.d("Contact", "name = " + name);                }            }            cursor.close();        }    }    @Override    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {        // id 就是联系人 id        // select * from data where contact_id = id and type = phone        ContentResolver resolver = getContentResolver();        // 获取一个联系人的所有手机号，那么使用 Phone 这个类        Cursor cursor = resolver.query(                ContactsContract.CommonDataKinds.Phone.CONTENT_URI,                null,                ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=?",                new String[]{Long.toString(id)},                null        );        if (cursor != null) {            while (cursor.moveToNext()) {                // 获取手机号的列                int index = cursor.getColumnIndex(                        ContactsContract.CommonDataKinds.Phone.NUMBER                );                if (index != -1) {                    String phone = cursor.getString(index);                    Log.d("Phone", "email = " + phone);                }            }            cursor.close();        }    }    @Override    public boolean onItemLongClick(            AdapterView<?> parent,            View view,            int position,            long id) {        boolean b = false;        // 1. ContentResolver        // 2. delete + where        ContentResolver resolver = getContentResolver();        // 3. 删除联系人，必须要使用 RawContacts 表        // delete from raw_contacts where contact_id=id        int num = resolver.delete(                ContactsContract.RawContacts.CONTENT_URI,                ContactsContract.RawContacts.CONTACT_ID + "=?",                new String[]{Long.toString(id)}        );        if (num > 0) {            requeryCursor();        }        return b;    }    public void requeryCursor() {        ContentResolver resolver = getContentResolver();        Cursor cursor = resolver.query(                ContactsContract.Contacts.CONTENT_URI,                null,                null,                null,                null        );        mAdapter.changeCursor(cursor);    }    @Override    public void onClick(View v) {        Object tag = v.getTag();        Long id = (Long) tag;        Toast.makeText(MainActivity.this, "del " + id, Toast.LENGTH_SHORT).show();        ContentResolver resolver = getContentResolver();        int num = resolver.delete(                ContactsContract.RawContacts.CONTENT_URI,                ContactsContract.RawContacts.CONTACT_ID + "=?",                new String[]{Long.toString(id)}        );        if (num > 0) {            requeryCursor();        }    }}

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