如何实现OnItemClickListener在这个code？ [英] how to implement OnItemClickListener in this code?
本文介绍了如何实现OnItemClickListener在这个code？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想在这个ListView控件来实现OnItemClickListener，但是当我添加code对于这一点，我的应用程序甚至不会没有错误工作。它会自动关闭，当我点击ListView项。请帮助我，我是Android的初学者。我在这里将我的整个code。
我做的蓝牙设备连接code。
I want to implement OnItemClickListener in this ListView ,But when i add code for this,my app will not work even there is no error. its closes automatically when I click on the Listview item. Please help me, I am a beginner in Android. I am adding my whole code here. I am doing a bluetooth device connectivity code.
MainActivity.java
import java.util.ArrayList;
import java.util.Set;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.app.Activity;
import android.app.ProgressDialog;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
public class MainActivity extends Activity {
private TextView mStatusTv;
private Button mActivateBtn;
private Button mPairedBtn;
private Button mScanBtn;
private Button ledBtn;
private ProgressDialog mProgressDlg;
private ArrayList<BluetoothDevice> mDeviceList = new ArrayList<BluetoothDevice>();
private BluetoothAdapter mBluetoothAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mStatusTv = (TextView) findViewById(R.id.tv_status);
mActivateBtn = (Button) findViewById(R.id.btn_enable);
mPairedBtn = (Button) findViewById(R.id.btn_view_paired);
mScanBtn = (Button) findViewById(R.id.btn_scan);
ledBtn = (Button) findViewById(R.id.led);
ledBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i=new Intent(getApplicationContext(),Ledbuttons.class);
startActivity(i);
}
});
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mProgressDlg = new ProgressDialog(this);
mProgressDlg.setMessage("Scanning...");
mProgressDlg.setCancelable(false);
mProgressDlg.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
mBluetoothAdapter.cancelDiscovery();
}
});
if (mBluetoothAdapter == null) {
showUnsupported();
} else {
mPairedBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
if (pairedDevices == null || pairedDevices.size() == 0) {
showToast("No Paired Devices Found");
} else {
ArrayList<BluetoothDevice> list = new ArrayList<BluetoothDevice>();
list.addAll(pairedDevices);
Intent intent = new Intent(MainActivity.this, DeviceListActivity.class);
intent.putParcelableArrayListExtra("device.list", list);
startActivity(intent);
}
}
});
mScanBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
mBluetoothAdapter.startDiscovery();
}
});
mActivateBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mBluetoothAdapter.isEnabled()) {
mBluetoothAdapter.disable();
showDisabled();
} else {
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(intent, 1000);
}
}
});
if (mBluetoothAdapter.isEnabled()) {
showEnabled();
} else {
showDisabled();
}
}
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
filter.addAction(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(mReceiver, filter);
}
@Override
public void onPause() {
if (mBluetoothAdapter != null) {
if (mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
}
super.onPause();
}
@Override
public void onDestroy() {
unregisterReceiver(mReceiver);
super.onDestroy();
}
private void showEnabled() {
mStatusTv.setText("Bluetooth is On");
mStatusTv.setTextColor(Color.BLUE);
mActivateBtn.setText("Disable");
mActivateBtn.setEnabled(true);
mPairedBtn.setEnabled(true);
mScanBtn.setEnabled(true);
ledBtn.setEnabled(true);
}
private void showDisabled() {
mStatusTv.setText("Bluetooth is Off");
mStatusTv.setTextColor(Color.RED);
mActivateBtn.setText("Enable");
mActivateBtn.setEnabled(true);
mPairedBtn.setEnabled(false);
mScanBtn.setEnabled(false);
ledBtn.setEnabled(false);
}
private void showUnsupported() {
mStatusTv.setText("Bluetooth is unsupported by this device");
mActivateBtn.setText("Enable");
mActivateBtn.setEnabled(false);
mPairedBtn.setEnabled(false);
mScanBtn.setEnabled(false);
}
private void showToast(String message) {
Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)) {
final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
if (state == BluetoothAdapter.STATE_ON) {
showToast("Enabled");
showEnabled();
}
} else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
mDeviceList = new ArrayList<BluetoothDevice>();
mProgressDlg.show();
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
mProgressDlg.dismiss();
Intent newIntent = new Intent(MainActivity.this, DeviceListActivity.class);
newIntent.putParcelableArrayListExtra("device.list", mDeviceList);
startActivity(newIntent);
} else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = (BluetoothDevice) intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
mDeviceList.add(device);
showToast("Found device " + device.getName());
}
}
};
DeviceListActivity.java
import java.lang.reflect.Method;
import java.util.ArrayList;
import android.app.Activity;
import android.bluetooth.BluetoothDevice;
import android.os.Bundle;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;
public class DeviceListActivity extends Activity {
private ListView mListView;
private DeviceListAdapter mAdapter;
private ArrayList<BluetoothDevice> mDeviceList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDeviceList = getIntent().getExtras().getParcelableArrayList("device.list");
mListView = (ListView) findViewById(R.id.lv_paired);
mAdapter = new DeviceListAdapter(this);
mAdapter.setData(mDeviceList);
mAdapter.setListener(new DeviceListAdapter.OnPairButtonClickListener() {
@Override
public void onPairButtonClick(int position) {
BluetoothDevice device = mDeviceList.get(position);
if (device.getBondState() == BluetoothDevice.BOND_BONDED) {
unpairDevice(device);
} else {
showToast("Pairing...");
pairDevice(device);
}
}
});
mListView.setAdapter(mAdapter);
registerReceiver(mPairReceiver, new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED));
}
@Override
public void onDestroy() {
unregisterReceiver(mPairReceiver);
super.onDestroy();
}
private void showToast(String message) {
Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
}
private void pairDevice(BluetoothDevice device) {
try {
Method method = device.getClass().getMethod("createBond", (Class[]) null);
method.invoke(device, (Object[]) null);
} catch (Exception e) {
e.printStackTrace();
}
}
private void unpairDevice(BluetoothDevice device) {
try {
Method method = device.getClass().getMethod("removeBond", (Class[]) null);
method.invoke(device, (Object[]) null);
} catch (Exception e) {
e.printStackTrace();
}
}
private final BroadcastReceiver mPairReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
final int state = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, BluetoothDevice.ERROR);
final int prevState = intent.getIntExtra(BluetoothDevice.EXTRA_PREVIOUS_BOND_STATE, BluetoothDevice.ERROR);
if (state == BluetoothDevice.BOND_BONDED && prevState == BluetoothDevice.BOND_BONDING) {
showToast("Paired");
} else if (state == BluetoothDevice.BOND_NONE && prevState == BluetoothDevice.BOND_BONDED){
showToast("Unpaired");
}
mAdapter.notifyDataSetChanged();
}
}
};
}
DeviceListAdapter.java
import java.util.List;
import android.bluetooth.BluetoothDevice;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
public class DeviceListAdapter extends BaseAdapter{
private LayoutInflater mInflater;
private List<BluetoothDevice> mData;
private OnPairButtonClickListener mListener;
public DeviceListAdapter(Context context) {
mInflater = LayoutInflater.from(context);
}
public void setData(List<BluetoothDevice> data) {
mData = data;
}
public void setListener(OnPairButtonClickListener listener) {
mListener = listener;
}
public int getCount() {
return (mData == null) ? 0 : mData.size();
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item_device, null);
holder = new ViewHolder();
holder.nameTv = (TextView) convertView.findViewById(R.id.tv_name);
holder.addressTv = (TextView) convertView.findViewById(R.id.tv_address);
holder.pairBtn = (Button) convertView.findViewById(R.id.btn_pair);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
BluetoothDevice device = mData.get(position);
holder.nameTv.setText(device.getName());
holder.addressTv.setText(device.getAddress());
holder.pairBtn.setText((device.getBondState() == BluetoothDevice.BOND_BONDED) ? "Unpair" : "Pair");
holder.pairBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mListener != null) {
mListener.onPairButtonClick(position);
}
}
});
return convertView;
}
static class ViewHolder {
TextView nameTv;
TextView addressTv;
TextView pairBtn;
}
public interface OnPairButtonClickListener {
public abstract void onPairButtonClick(int position);
}
}
activity_main.xml中
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#060606"
android:orientation="vertical"
android:padding="@dimen/activity_vertical_margin" >
<TextView
android:id="@+id/tv_status"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@string/text_bluetooth_off"
android:textColor="#ff0000"
android:textSize="17sp" />
<Button
android:id="@+id/btn_enable"
android:layout_width="match_parent"
android:layout_height="33dp"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:background="#585858"
android:text="@string/text_enable" />
<Button
android:id="@+id/btn_view_paired"
android:layout_width="match_parent"
android:layout_height="33dp"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:background="#585858"
android:enabled="false"
android:text="@string/text_view_paired"
android:textColor="#FFFFFF" />
<Button
android:id="@+id/btn_scan"
android:layout_width="match_parent"
android:layout_height="33dp"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:background="#585858"
android:enabled="false"
android:text="@string/text_scan_devices"
android:textColor="#FFFFFF" />
<Button
android:id="@+id/led"
android:layout_width="match_parent"
android:layout_height="33dp"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:background="#585858"
android:enabled="false"
android:text="LEDS"
android:textColor="#FFFFFF" />
<TextView
android:id="@+id/TextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="List Of Devices"
android:textColor="#ff0000"
android:textSize="15sp" />
<ScrollView
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ScrollView>
<ListView
android:id="@+id/lv_paired"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>
list_item_device.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingTop="5dp"
android:paddingBottom="5dp">
<Button
android:id="@+id/btn_pair"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="Pair"
android:textColor="#ff4444" />
<TextView
android:id="@+id/tv_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignTop="@+id/btn_pair"
android:layout_toLeftOf="@+id/btn_pair"
android:text="Galaxy Nexus"
android:textColor="#99cc00"
android:textSize="16sp" />
<TextView
android:id="@+id/tv_address"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/btn_pair"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="@+id/btn_pair"
android:text="000000000"
android:textColor="#ffbd21" />
</RelativeLayout>
我是不解决问题的。
My Problems that not solved are
-
当我添加onItemclicklistener到列表视图中的应用程序无法正常工作。
The app is not working when I add an onItemclicklistener to the list view.
蓝牙搜索结果与相同的设备名称填写。
bluetooth search result is filling with the same device name.
我不能观看配对设备后，访问按钮和
扫描设备（好像是相同的布局被弹出到屏幕）。
I cannot access the buttons after viewing pairing devices and scanned devices(it seems like that the same layout is popping to screen).
请人帮我解决这些问题。
Anyone please help me to solve these issues.
在此先感谢。
推荐答案
您可以做这样的 -
You can just do like this -
mListView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(getApplicationContext(), " ITEM CLICKED POSITION = "+String.valueOf(position), Toast.LENGTH_SHORT).show();
}
});
这篇关于如何实现OnItemClickListener在这个code？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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