Android 如何使用ListView和ArrayAdapter将内容添加到ListView中?
我正在开发一个必须连接到蓝牙设备的应用程序 当我点击btn_discoverAndroid 如何使用ListView和ArrayAdapter将内容添加到ListView中?,android,android-listview,bluetooth,Android,Android Listview,Bluetooth,我正在开发一个必须连接到蓝牙设备的应用程序 当我点击btn_discover按钮时,它将调用BroadcastReceiver,扫描新的蓝牙设备并显示在文本视图上 当我使用TextView时,我可以在TextView上看到蓝牙设备 现在我想将文本视图更改为列表视图 但它总是崩溃。在BroadcastReceiver的onReceive()中,我写道: newDevicelistArrayAdapter.add(device.getName()); 这是我的Java代码: package com
按钮时,它将调用BroadcastReceiver
,扫描新的蓝牙设备并显示在文本视图上
当我使用TextView
时,我可以在TextView上看到蓝牙设备
现在我想将文本视图
更改为列表视图
但它总是崩溃。在BroadcastReceiver
的onReceive()
中,我写道:
newDevicelistArrayAdapter.add(device.getName());
这是我的Java代码:
package com.example.bttest;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Set;
import com.example.bttest.R.menu;
import android.os.Bundle;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class Main extends Activity {
public BluetoothAdapter mBluetoothAdapter;
private static final int REQUEST_SELECT_DEVICE = 1;
public Button btn_scan;
public Button btn_discover;
public TextView pair_list;
public TextView scan_list;
public ListView scan_list_1;
public Set<BluetoothDevice> pairedDevices;
public ArrayAdapter<String> newDevicelistArrayAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn_scan = (Button)findViewById(R.id.btn_scan);
btn_discover = (Button)findViewById(R.id.btn_discover);
pair_list = (TextView)findViewById(R.id.pair_list);
scan_list = (TextView)findViewById(R.id.scan_list);
newDevicelistArrayAdapter = new ArrayAdapter<String>(this, R.layout.main);
scan_list_1 = (ListView)findViewById(R.id.scan_list_1);
scan_list_1.setAdapter(newDevicelistArrayAdapter);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null)
{
Toast.makeText(this, "No support bluetooth", Toast.LENGTH_SHORT).show();
return;
}else if(mBluetoothAdapter != null) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_SELECT_DEVICE);
}
//******************scan按鈕動作-將已配對過的藍芽裝置列出來
btn_scan.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
pairedDevices = mBluetoothAdapter.getBondedDevices();
if(pairedDevices.size()>0) {
for(BluetoothDevice bDevice : pairedDevices) {
pair_list.append(bDevice.getName() + "\n" + bDevice.getAddress() + "\n" + bDevice.getBondState() + "\n" );
}
}
}
});
//******************scan按鈕動作結束
btn_discover.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter);
filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(mReceiver, filter);
mBluetoothAdapter.startDiscovery();
}
});
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
scan_list.append(device.getName() + "\n" + device.getAddress() + "\n");
newDevicelistArrayAdapter.add(device.getName());
}
}
};
protected void onDestroy() {
super.onDestroy();
if (mBluetoothAdapter != null) {
mBluetoothAdapter.cancelDiscovery();
}
unregisterReceiver(mReceiver);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
package com.example.bttest;
导入java.util.ArrayList;
导入java.util.HashMap;
导入java.util.Set;
导入com.example.bttest.R.menu;
导入android.os.Bundle;
导入android.app.Activity;
导入android.bluetooth.BluetoothAdapter;
导入android.bluetooth.bluetooth设备;
导入android.content.BroadcastReceiver;
导入android.content.Context;
导入android.content.Intent;
导入android.content.IntentFilter;
导入android.view.Menu;
导入android.view.view;
导入android.view.view.OnClickListener;
导入android.widget.ArrayAdapter;
导入android.widget.Button;
导入android.widget.ListView;
导入android.widget.TextView;
导入android.widget.Toast;
公共类主要扩展活动{
公共蓝牙适配器mBluetoothAdapter;
专用静态最终整数请求\u选择\u设备=1;
公共按钮btn\U扫描;
公共按钮btn_discover;
公共文本视图对列表;
公共文本视图扫描列表;
公共列表视图扫描列表1;
公共集对设备;
公共阵列适配器新设备适配器;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn_扫描=(按钮)findViewById(R.id.btn_扫描);
btn_discover=(按钮)findviewbyd(R.id.btn_discover);
pair_list=(TextView)findViewById(R.id.pair_list);
扫描列表=(文本视图)findViewById(R.id.scan\u列表);
newDeviceListarayAdapter=新阵列适配器(this,R.layout.main);
scan_list_1=(ListView)findViewById(R.id.scan_list_1);
扫描列表1.setAdapter(NewDeviceListarayAdapter);
mBluetoothAdapter=BluetoothAdapter.getDefaultAdapter();
if(mBluetoothAdapter==null)
{
Toast.makeText(这是“不支持蓝牙”,Toast.LENGTH_SHORT).show();
返回;
}else if(mBluetoothAdapter!=null){
Intent enablebintent=新意图(BluetoothAdapter.ACTION\u REQUEST\u ENABLE);
startActivityForResult(启用BTINTENT、请求和选择设备);
}
//******************扫描按鈕動作-將已配對過的藍芽裝置列出來
btn_scan.setOnClickListener(新的OnClickListener(){
@凌驾
公共void onClick(视图v){
//TODO自动生成的方法存根
pairedDevices=mBluetoothAdapter.getBondedDevices();
如果(pairedDevices.size()>0){
用于(蓝牙设备b设备:pairedDevices){
pair_list.append(bDevice.getName()+“\n”+bDevice.getAddress()+“\n”+bDevice.getBondState()+”\n”);
}
}
}
});
//******************扫描按鈕動作結束
btn_discover.setOnClickListener(新的OnClickListener(){
@凌驾
公共void onClick(视图v){
//TODO自动生成的方法存根
IntentFilter筛选器=新的IntentFilter(BluetoothDevice.ACTION\u已找到);
registerReceiver(mrReceiver,过滤器);
过滤器=新的IntentFilter(BluetoothAdapter.ACTION\u DISCOVERY\u FINISHED);
registerReceiver(mrReceiver,过滤器);
mBluetoothAdapter.startDiscovery();
}
});
}
专用最终广播接收器mReceiver=新广播接收器(){
@凌驾
公共void onReceive(上下文、意图){
//TODO自动生成的方法存根
String action=intent.getAction();
if(BluetoothDevice.ACTION_FOUND.equals(ACTION)){
BluetoothDevice=intent.getParcelableExtra(BluetoothDevice.EXTRA\u设备);
扫描列表.append(device.getName()+“\n”+device.getAddress()+”\n”);
newDeviceListarayAdapter.add(device.getName());
}
}
};
受保护的空onDestroy(){
super.ondestory();
if(mBluetoothAdapter!=null){
mBluetoothAdapter.cancelDiscovery();
}
未注册接收人(mReceiver);
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.main,menu);
返回true;
}
}
使用ListView和ArrayAdapter时是否有任何错误?将您的广播接收器的onReceive()
替换为以下内容:
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
scan_list.append(device.getName() + "\n" + device.getAddress() + "\n");
newDevicelistArrayAdapter.notifyDataSetChanged();
}
}
但它总是崩溃
-然后请从logcat发布堆栈跟踪,以便我们知道错误是什么。