首先,对不起我的英语不好,我是西班牙人(并且是 android 开发的新手)。我正在开发一个简单的蓝牙文件发送器,我是基于 BluetoothChat android 示例一步一步来的。
现在我向用户发出蓝牙激活请求,并选择是或否选项应用程序崩溃。
我拥有清单中声明的权限。
问题是,如果用户选择是来激活蓝牙,蓝牙实际上会激活,但之后应用程序仍然崩溃。
我不知道ACRA是否与此冲突,我正在使用它,因为mi设备是华为u8650并且我没有找到直接在eclipse中运行应用程序的usb驱动程序,所以我每次移动.apk文件时间到SD卡。
这是清单:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.BTSender"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="10" />
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" android:name="MyApplication">
<activity
android:name=".BluetoothSenderActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
这是主要的(也是唯一的)活动:
package com.BTSender;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
public class BluetoothSenderActivity extends Activity {
private BluetoothAdapter BTAdapter;
private String TAG = "BTSender";
private final int REQUEST_ENABLE_BT = 2;
@Override
public void onCreate(Bundle savedInstanceState) {
// Creating window layout
Log.v(TAG, "**Creating window**");
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.v(TAG, "**Window created");
// Get the bluetooth adapter
BTAdapter = BluetoothAdapter.getDefaultAdapter();
// If null, that means bluetooth is not supported on the device
if (BTAdapter == null) {
Toast.makeText(this, R.string.BluetoothNotSupported,
Toast.LENGTH_LONG).show();
finish();
return;
}
}
@Override
public void onStart() {
// Check if Bluetooth is enabled, otherwise request user to enable it
if (!BTAdapter.isEnabled()) {
// IT NEEDS BLUETOOTH PERMISSION
// Intent to enable bluetooth, it will show the enable bluetooth
// dialog
Intent enableIntent = new Intent(
BluetoothAdapter.ACTION_REQUEST_ENABLE);
// this is to get a result if bluetooth was enabled or not
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
// It will call onActivityResult method to determine if Bluetooth
// was enabled or not
} else {
// Bluetooth is enabled
}
}
// this will be called when in onStart method startActivityForResult is
// executed
public void onActivityResult(int requestCode, int resultCode, Intent data) {
Log.v(TAG, "** onActivityResult **");
// determine from which activity
switch (requestCode) {
// if it was the request to enable Bluetooth:
case REQUEST_ENABLE_BT:
if (resultCode == Activity.RESULT_OK) {
// Bluetooth is enabled now
Log.v(TAG, "** Bluetooth is now enabled**");
} else {
// user decided not to enable Bluetooth so exit application
Log.v(TAG, "** Bluetooth is NOT enabled**");
Toast.makeText(this, R.string.BluetoothNotEnabled,
Toast.LENGTH_LONG).show();
finish();
}
}
}
}
我最近在 Stackoverflow 上阅读了答案,这是我的第一个问题。我会很感激任何答案。还有关于改进我的开发的提示。提前致谢!
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.BTSender/com.BTSender.BluetoothSenderActivity}:
java.lang.SecurityException: Need BLUETOOTH permission: Neither user 10076 nor current
process has android.permission.BLUETOOTH.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1654)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1670)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3695)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.SecurityException: Need BLUETOOTH permission: Neither user 10076
nor current process has android.permission.BLUETOOTH.
at android.os.Parcel.readException(Parcel.java:1322)
at android.os.Parcel.readException(Parcel.java:1276)
at android.bluetooth.IBluetooth$Stub$Proxy.isEnabled(IBluetooth.java:496)
at android.bluetooth.BluetoothAdapter.isEnabled(BluetoothAdapter.java:351)
at com.BTSender.BluetoothSenderActivity.onStart(BluetoothSenderActivity.java:51)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1129)
at android.app.Activity.performStart(Activity.java:3791)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1627)
... 11 more
java.lang.SecurityException: Need BLUETOOTH permission: Neither user 10076 nor current
process has android.permission.BLUETOOTH.
at android.os.Parcel.readException(Parcel.java:1322)
at android.os.Parcel.readException(Parcel.java:1276)
at android.bluetooth.IBluetooth$Stub$Proxy.isEnabled(IBluetooth.java:496)
at android.bluetooth.BluetoothAdapter.isEnabled(BluetoothAdapter.java:351)
at com.BTSender.BluetoothSenderActivity.onStart(BluetoothSenderActivity.java:51)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1129)
at android.app.Activity.performStart(Activity.java:3791)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1627)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1670)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3695)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
如果有帮助。安装应用程序时,它会显示三个权限:internet、bluetooth 和 bluetooth_admin,然后运行 BluetoothAdapter.getDefaultAdapter();没有问题,即使它运行蓝牙请求的意图,但是当应用程序崩溃时 onActivityResult 开始发挥作用,就像应用程序失去了蓝牙权限一样,但这很奇怪。