Android 基础-2.0 拔打*

1、添加权限

在AndroidManifest.xml 添加打电话权限

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

2、自动布局设置页面

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <TextView
        android:id="@+id/tv_phone"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="10dp"
        android:text="@string/textPhone"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/et_phone"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="10dp"
        android:layout_marginRight="10dp"
        android:hint="@string/textPhoneHint"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tv_phone" />

    <Button
        android:id="@+id/btn_call"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="10dp"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="16dp"
        android:text="@string/textPhoneButton"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/et_phone" />


</androidx.constraintlayout.widget.ConstraintLayout>

页面效果

3、给Activity添加拔打代码

public class MainActivity extends  BaseActivity {

    private Button eBtCall;
    private EditText mEtPhone;

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

        eBtCall = findViewById(R.id.btn_call);
        mEtPhone = findViewById(R.id.et_phone);
        eBtCall.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                performCodeWithPermission("拔打电话权限", new PermissionCallback() {
                    @Override
                    public void hasPermission() {
                        Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + mEtPhone.getText()));
                        startActivity(intent);
                    }

                    @Override
                    public void noPermission() {

                    }
                }, Manifest.permission.CALL_PHONE);
            }
        });
    }
}

4、这里要注意，安卓在6.0之后是动态申请系统权限，因而封装一个权限的BaseActivity类，专门用于处理权限相关的。

package com.jiangys.telephonedial;

import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.os.Build;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

/**
 * @author Admin
 * @version $Rev$
 * @des ${TODO}
 * @updateAuthor $Author$
 * @updateDes ${TODO}
 */
public class BaseActivity extends AppCompatActivity {
    //**************** Android M Permission (Android 6.0权限控制代码封装)
    private int permissionRequestCode = 88;
    private PermissionCallback permissionRunnable;

    public interface PermissionCallback {
        void hasPermission();

        void noPermission();
    }

    /**
     * Android M运行时权限请求封装
     *
     * @param permissionDes 权限描述
     * @param runnable      请求权限回调
     * @param permissions   请求的权限（数组类型），直接从Manifest中读取相应的值，比如Manifest.permission.WRITE_CONTACTS
     */
    public void performCodeWithPermission(@NonNull String permissionDes, PermissionCallback runnable, @NonNull String... permissions) {
        if (permissions == null || permissions.length == 0)
            return;
        //        this.permissionrequestCode = requestCode;
        this.permissionRunnable = runnable;
        if ((Build.VERSION.SDK_INT < Build.VERSION_CODES.M) || checkPermissionGranted(permissions)) {
            if (permissionRunnable != null) {
                permissionRunnable.hasPermission();
                permissionRunnable = null;
            }
        } else {
            //permission has not been granted.
            requestPermission(permissionDes, permissionRequestCode, permissions);
        }

    }

    private boolean checkPermissionGranted(String[] permissions) {
        boolean flag = true;
        for (String p : permissions) {
            if (ActivityCompat.checkSelfPermission(this, p) != PackageManager.PERMISSION_GRANTED) {
                flag = false;
                break;
            }
        }
        return flag;
    }

    private void requestPermission(String permissionDes, final int requestCode, final String[] permissions) {
        if (shouldShowRequestPermissionRationale(permissions)) {
            /*1. 第一次请求权限时，用户拒绝了，下一次：shouldShowRequestPermissionRationale()  返回 true，应该显示一些为什么需要这个权限的说明
            2.第二次请求权限时，用户拒绝了，并选择了“不在提醒”的选项时：shouldShowRequestPermissionRationale()  返回 false
            3. 设备的策略禁止当前应用获取这个权限的授权：shouldShowRequestPermissionRationale()  返回 false*/
            // Provide an additional rationale to the user if the permission was not granted
            // and the user would benefit from additional context for the use of the permission.
            // For example, if the request has been denied previously.

            //            Snackbar.make(getWindow().getDecorView(), requestName,
            //                    Snackbar.LENGTH_INDEFINITE)
            //                    .setAction(R.string.common_ok, new View.OnClickListener() {
            //                        @Override
            //                        public void onClick(View view) {
            //                            ActivityCompat.requestPermissions(BaseAppCompatActivity.this,
            //                                    permissions,
            //                                    requestCode);
            //                        }
            //                    })
            //                    .show();
            //如果用户之前拒绝过此权限，再提示一次准备授权相关权限
            new AlertDialog.Builder(this)
                    .setTitle("提示")
                    .setMessage(permissionDes)
                    .setPositiveButton("授权", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            ActivityCompat.requestPermissions(BaseActivity.this, permissions, requestCode);
                        }
                    }).show();

        } else {
            // Contact permissions have not been granted yet. Request them directly.
            ActivityCompat.requestPermissions(BaseActivity.this, permissions, requestCode);
        }
    }

    private boolean shouldShowRequestPermissionRationale(String[] permissions) {
        boolean flag = false;
        for (String p : permissions) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(this, p)) {
                flag = true;
                break;
            }
        }
        return flag;
    }

    /**
     * Callback received when a permissions request has been completed.
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        if (requestCode == permissionRequestCode) {
            if (verifyPermissions(grantResults)) {
                if (permissionRunnable != null) {
                    permissionRunnable.hasPermission();
                    permissionRunnable = null;
                }
            } else {
                Toast.makeText(this, "暂无权限执行相关操作！", Toast.LENGTH_SHORT).show();
                if (permissionRunnable != null) {
                    permissionRunnable.noPermission();
                    permissionRunnable = null;
                }
            }
        } else {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }

    }

    public boolean verifyPermissions(int[] grantResults) {
        // At least one result must be checked.
        if (grantResults.length < 1) {
            return false;
        }

        // Verify that each required permission has been granted, otherwise return false.
        for (int result : grantResults) {
            if (result != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }
    //********************** END Android M Permission ****************************************
}