Android应用中实现点击按钮拨打电话功能及运行时权限处理

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="your.package.name">

    <uses-permission android:name="android.permission.CALL_PHONE" />

    <!-- 其他组件和权限 -->
</manifest>

EditText client_number; // 假设已通过findViewById初始化

// 在需要获取号码的地方
String phoneNumber = client_number.getText().toString();

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

public class MainActivity extends AppCompatActivity {

    private static final int PERMISSION_REQUEST_CALL_PHONE = 0;
    private Button button_call;
    private EditText client_number; // 假设此EditText用于输入电话号码

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button_call = findViewById(R.id.button_call);
        client_number = findViewById(R.id.client_number); // 假设您的布局中有此ID

        button_call.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // 确保电话号码不为空
                String phoneNumber = client_number.getText().toString().trim();
                if (phoneNumber.isEmpty()) {
                    Toast.makeText(MainActivity.this, "请输入电话号码", Toast.LENGTH_SHORT).show();
                    return;
                }
                makePhoneCall(phoneNumber);
            }
        });
    }

    private void makePhoneCall(String phoneNumber) {
        // 检查是否已获得CALL_PHONE权限
        boolean isPermissionGranted = (ContextCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) == PackageManager.PERMISSION_GRANTED);

        if (isPermissionGranted) {
            // 权限已授予，直接发起通话
            Intent intent = new Intent(Intent.ACTION_CALL);
            intent.setData(Uri.parse("tel:" + phoneNumber));
            try {
                startActivity(intent);
            } catch (SecurityException e) {
                Toast.makeText(this, "拨打电话失败，请检查权限设置", Toast.LENGTH_SHORT).show();
                e.printStackTrace();
            }
        } else {
            // 权限未授予，请求权限
            Toast.makeText(this, "缺少拨打电话权限，正在请求...", Toast.LENGTH_SHORT).show();
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CALL_PHONE}, PERMISSION_REQUEST_CALL_PHONE);
        }
    }
}

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PERMISSION_REQUEST_CALL_PHONE) {
            // 检查所有请求的权限是否都被授予
            boolean allPermissionsGranted = true;
            for (int result : grantResults) {
                if (result != PackageManager.PERMISSION_GRANTED) {
                    allPermissionsGranted = false;
                    break;
                }
            }

            if (allPermissionsGranted) {
                // 权限已授予，可以再次尝试拨打电话
                Toast.makeText(this, "拨打电话权限已授予，正在尝试拨打...", Toast.LENGTH_SHORT).show();
                String phoneNumber = client_number.getText().toString().trim();
                if (!phoneNumber.isEmpty()) {
                    makePhoneCall(phoneNumber); // 再次调用拨打电话方法
                }
            } else {
                // 权限被拒绝
                Toast.makeText(this, "拨打电话权限被拒绝，无法拨打电话。", Toast.LENGTH_LONG).show();
                // 可以在此处引导用户去设置中手动开启权限
            }
        }
    }