我尝试使用 JAVA 授予在 Android Studio 上启用和禁用蓝牙的访问权限;但 startActivityForResult 已被弃用。我能做什么？

Question

我想从Android Studio授予对启用和禁用蓝牙的访问权限。我还假装使用蓝牙的其他功能作为设备列表，并连接到以前的精简设备等。

由于starActivityForResult已经被弃用，我很难处理向用户请求津贴的弹出活动。

这是我的清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.bluetoothonofftest"
tools:ignore="CoarseFineLocation">
<!-- Request legacy Bluetooth permissions on older devices. -->
<uses-permission android:name="android.permission.BLUETOOTH"
android:maxSdkVersion="30" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"
android:maxSdkVersion="30"
tools:ignore="CoarseFineLocation" />
<!-- Needed only if your app looks for Bluetooth devices.
If your app doesn't use Bluetooth scan results to derive physical
location information, you can strongly assert that your app
doesn't derive physical location. -->
<uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
<!-- Needed only if your app makes the device discoverable to Bluetooth
devices. -->
<uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
<!-- Needed only if your app communicates with already-paired Bluetooth
devices. -->
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
<!-- Needed only if your app uses Bluetooth scan results to derive physical location. -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
<uses-feature android:name="android.hardware.bluetooth" android:required="true"/>
<uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.BlUetoothTest">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>   

这是我的ManinActivity

package com.example.bluetoothexamples;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.Set;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private static final int REQUEST_ENABLE_BT = 0;
private static final int REQUEST_DISCOVER_BT = 1;
TextView mStatusBlueTv;
TextView mPairedTv;
ImageView mBlueIv;
Button mOnBtn;
Button mOffBtn;
Button mDiscoverBtn;
Button mPairedBtn;
BluetoothAdapter mBlueAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mStatusBlueTv = findViewById(R.id.statusBluetoothTv);
mPairedTv = findViewById(R.id.pairedTv);
mBlueIv = findViewById(R.id.bluetoothIv);
mOnBtn = findViewById(R.id.onBtn);
mOffBtn = findViewById(R.id.offBtn);
mDiscoverBtn = findViewById(R.id.discoverableBtn);
mPairedBtn = findViewById(R.id.pairedBtn);
// Adapter
mBlueAdapter = BluetoothAdapter.getDefaultAdapter();
//Check if bluetooth is available or not
if (mBlueAdapter == null) {
mStatusBlueTv.setText("Bluetooth is NOT Available");
} else {
mStatusBlueTv.setText("Bluetooth is Available");
// Set image according to bluetooth status (on/off)
if (mBlueAdapter.isEnabled()) {
mBlueIv.setImageResource(R.drawable.ic_action_on);
} else {
mBlueIv.setImageResource(R.drawable.ic_action_off);
}
mOnBtn.setOnClickListener(this);          // Turn on Bluetooth btn click
mDiscoverBtn.setOnClickListener(this);    // Discover bluetooth btn click
mOffBtn.setOnClickListener(this);         // Turn off Bluetooth btn click
mPairedBtn.setOnClickListener(this);      // Get Paired devices button click
}
}
@Override
public void onClick(View view) {
switch (view.getId()) {
// Turn on Bluetooth btn click
case R.id.onBtn:
if (!mBlueAdapter.isEnabled()) {
// showToast("Turning On Bluetooth...");
//                    if (getApplicationContext().checkSelfPermission(Manifest.permission.BLUETOOTH_ADMIN) != PackageManager.PERMISSION_GRANTED) {
//                    } else {
//                        requestPermissions(new String[]{Manifest.permission.BLUETOOTH_ADMIN},1);
//                    }

if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.BLUETOOTH_ADMIN},1);
// here to request the missing permissions, and then overriding
//   public void onRequestPermissionsResult(int requestCode, String[] permissions,
//                                          int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
// Intent to On Bluetooth
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(intent, REQUEST_ENABLE_BT);
}
else {
showToast("Bluetooth is already on");
}
break;
// Discover bluetooth btn click
case R.id.discoverableBtn:
if (!mBlueAdapter.isDiscovering()){
showToast("Making Your Device Discoverable");
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
startActivityForResult(intent ,REQUEST_DISCOVER_BT);
}
break;
// Turn off Bluetooth btn click
case R.id.offBtn:
if (mBlueAdapter.isEnabled()) {
mBlueAdapter.disable();
showToast("Turning Bluetooth Off");
mBlueIv.setImageResource(R.drawable.ic_action_off);
}
else {
showToast("Bluetooth is already off");
}
break;
// Get Paired devices button click
case R.id.pairedBtn:
if (mBlueAdapter.isEnabled()) {
mPairedTv.setText("Paired Devices");
Set<BluetoothDevice> devices = mBlueAdapter.getBondedDevices();
for (BluetoothDevice device: devices){
mPairedTv.append("nDevice: " + device.getName() + ", " + device);
}
}
else {
//bluetooth is off so can't get paired devices
showToast("Turn ON Bluetooth to get paired devices");
}
break;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 1){
if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
showToast("Permission Granted");
}
else {
showToast("Permission Denied");
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
switch (requestCode){
case REQUEST_ENABLE_BT:
if (resultCode == RESULT_OK) {
// Bluetooth is on
mBlueIv.setImageResource(R.drawable.ic_action_on);
showToast("Bluetooth is on");
}
else {
showToast("Failed to connect to bluetooth");
}
break;
}
super.onActivityResult(requestCode, resultCode, data);
}
//Toast message function
private void showToast (String msg) {
Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
}
}

这是我的XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center_horizontal"
tools:context=".MainActivity">
<!--    Display whether bluetooth is available or not-->
<TextView
android:id="@+id/statusBluetoothTv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text=""
android:textAlignment="center"
android:textSize="20sp"
android:textColor="#000" />
<!--    Bluetooth icon-->
<ImageView
android:id="@+id/bluetoothIv"
android:layout_width="100dp"
android:layout_height="100dp" />
<!--    on Button-->
<Button
android:id="@+id/onBtn"
android:minWidth="200dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Turn On"
style="@style/Base.Widget.AppCompat.Button.Colored" />
<!--    off Button-->
<Button
android:id="@+id/offBtn"
android:minWidth="200dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Turn Off"
style="@style/Base.Widget.AppCompat.Button.Colored" />
<!--    Discoverable button-->
<Button
android:id="@+id/discoverableBtn"
android:minWidth="200dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Discoverable"
style="@style/Base.Widget.AppCompat.Button.Colored" />
<!--    Get list of paired devices button-->
<Button
android:id="@+id/pairedBtn"
android:minWidth="200dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Get Paired Devices"
style="@style/Base.Widget.AppCompat.Button.Colored" />
<!--    Show paired devices here-->
<TextView
android:id="@+id/pairedTv"
android:minWidth="200dp"
android:text=""
android:textColor="#000"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>

Answer 1

目前推荐的方法是使用ActivityResultLauncher来获得如下结果：

ActivityResultLauncher<Intent> activityResultLauncher = registerForActivityResult(
new ActivityResultContracts.StartActivityForResult(),
result -> {
if (result.getResultCode() == Activity.RESULT_OK) {
Log.e("Activity result","OK");
// There are no request codes
Intent data = result.getData();
}
});

所以就这样称呼它吧：

Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
activityResultLauncher.launch(intent);

对于您的情况，假设其他一切都很好，您可以更新到以下内容：

package com.example.bluetoothexamples;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.activity.result.ActivityResultLauncher;
import android.app.Activity;
import android.util.Log;
import java.util.Set;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private static final int REQUEST_ENABLE_BT = 0;
private static final int REQUEST_DISCOVER_BT = 1;
TextView mStatusBlueTv;
TextView mPairedTv;
ImageView mBlueIv;
Button mOnBtn;
Button mOffBtn;
Button mDiscoverBtn;
Button mPairedBtn;
BluetoothAdapter mBlueAdapter;
ActivityResultLauncher<Intent> activityResultLauncher = registerForActivityResult(
new ActivityResultContracts.StartActivityForResult(),
result -> {
if (result.getResultCode() == Activity.RESULT_OK) {
Log.e("Activity result","OK");
// There are no request codes
Intent data = result.getData();
}
});
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mStatusBlueTv = findViewById(R.id.statusBluetoothTv);
mPairedTv = findViewById(R.id.pairedTv);
mBlueIv = findViewById(R.id.bluetoothIv);
mOnBtn = findViewById(R.id.onBtn);
mOffBtn = findViewById(R.id.offBtn);
mDiscoverBtn = findViewById(R.id.discoverableBtn);
mPairedBtn = findViewById(R.id.pairedBtn);
// Adapter
mBlueAdapter = BluetoothAdapter.getDefaultAdapter();
//Check if bluetooth is available or not
if (mBlueAdapter == null) {
mStatusBlueTv.setText("Bluetooth is NOT Available");
} else {
mStatusBlueTv.setText("Bluetooth is Available");
// Set image according to bluetooth status (on/off)
if (mBlueAdapter.isEnabled()) {
mBlueIv.setImageResource(R.drawable.ic_action_on);
} else {
mBlueIv.setImageResource(R.drawable.ic_action_off);
}
mOnBtn.setOnClickListener(this);          // Turn on Bluetooth btn click
mDiscoverBtn.setOnClickListener(this);    // Discover bluetooth btn click
mOffBtn.setOnClickListener(this);         // Turn off Bluetooth btn click
mPairedBtn.setOnClickListener(this);      // Get Paired devices button click
}
}
@Override
public void onClick(View view) {
switch (view.getId()) {
// Turn on Bluetooth btn click
case R.id.onBtn:
if (!mBlueAdapter.isEnabled()) {
// showToast("Turning On Bluetooth...");
//                    if (getApplicationContext().checkSelfPermission(Manifest.permission.BLUETOOTH_ADMIN) != PackageManager.PERMISSION_GRANTED) {
//                    } else {
//                        requestPermissions(new String[]{Manifest.permission.BLUETOOTH_ADMIN},1);
//                    }

if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.BLUETOOTH_ADMIN},1);
// here to request the missing permissions, and then overriding
//   public void onRequestPermissionsResult(int requestCode, String[] permissions,
//                                          int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
// Intent to On Bluetooth
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
//  startActivityForResult(intent, REQUEST_ENABLE_BT);

activityResultLauncher.launch(intent);
}
else {
showToast("Bluetooth is already on");
}
break;
// Discover bluetooth btn click
case R.id.discoverableBtn:
if (!mBlueAdapter.isDiscovering()){
showToast("Making Your Device Discoverable");
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
//startActivityForResult(intent ,REQUEST_DISCOVER_BT);
activityResultLauncher.launch(intent);
}
break;
// Turn off Bluetooth btn click
case R.id.offBtn:
if (mBlueAdapter.isEnabled()) {
mBlueAdapter.disable();
showToast("Turning Bluetooth Off");
mBlueIv.setImageResource(R.drawable.ic_action_off);
}
else {
showToast("Bluetooth is already off");
}
break;
// Get Paired devices button click
case R.id.pairedBtn:
if (mBlueAdapter.isEnabled()) {
mPairedTv.setText("Paired Devices");
Set<BluetoothDevice> devices = mBlueAdapter.getBondedDevices();
for (BluetoothDevice device: devices){
mPairedTv.append("nDevice: " + device.getName() + ", " + device);
}
}
else {
//bluetooth is off so can't get paired devices
showToast("Turn ON Bluetooth to get paired devices");
}
break;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 1){
if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
showToast("Permission Granted");
}
else {
showToast("Permission Denied");
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
switch (requestCode){
case REQUEST_ENABLE_BT:
if (resultCode == RESULT_OK) {
// Bluetooth is on
mBlueIv.setImageResource(R.drawable.ic_action_on);
showToast("Bluetooth is on");
}
else {
showToast("Failed to connect to bluetooth");
}
break;
}
super.onActivityResult(requestCode, resultCode, data);
}
//Toast message function
private void showToast (String msg) {
Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
}
}

对于java<8:

ActivityResultLauncher<Intent> activityResultLauncher = registerForActivityResult(
new ActivityResultContracts.StartActivityForResult(), new ActivityResultCallback<ActivityResult>() {
@Override
public void onActivityResult(ActivityResult result) {
if (result.getResultCode() == Activity.RESULT_OK) {
Log.e("Activity result", "OK");
// There are no request codes
Intent data = result.getData();
}
}
}
);