Android-动态权限申请代码

Android 6.0版本之后，需要配置动态权限，动态权限代码有点多，纯粹记住是比较难的，所以这里提供一下模板代码，直接copy即可，然后修改或增加需要的权限即可。
基类文件RequestPermissionsActivityBase：

package com.android.face.permission;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Trace;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;

import java.util.ArrayList;
import java.util.Arrays;

/**
 * Activity that asks the user for all {@link #getDesiredPermissions} if any of
 * {@link #getRequiredPermissions} are missing.
 *
 * NOTE: As a result of b/22095159, this can behave oddly in the case where the final permission
 * you are requesting causes an application restart.
 */
public abstract class RequestPermissionsActivityBase extends Activity
        implements ActivityCompat.OnRequestPermissionsResultCallback {
    public static final String PREVIOUS_ACTIVITY_INTENT = "previous_intent";

    /** Whether the permissions activity was already started. */
    protected static final String STARTED_PERMISSIONS_ACTIVITY = "started_permissions_activity";

    private static final int PERMISSIONS_REQUEST_ALL_PERMISSIONS = 1;

    /**
     * @return list of permissions that are needed in order for {@link #PREVIOUS_ACTIVITY_INTENT} to
     * operate. You only need to return a single permission per permission group you care about.
     */
    protected abstract String[] getRequiredPermissions();
    
    /**
     * @return list of permissions that would be useful for {@link #PREVIOUS_ACTIVITY_INTENT} to
     * operate. You only need to return a single permission per permission group you care about.
     */
    protected abstract String[] getDesiredPermissions();

    protected Intent mPreviousActivityIntent;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mPreviousActivityIntent = (Intent) getIntent().getExtras().get(PREVIOUS_ACTIVITY_INTENT);
        
        // Only start a requestPermissions() flow when first starting this activity the first time.
        // The process is likely to be restarted during the permission flow (necessary to enable
        // permissions) so this is important to track.
        if (savedInstanceState == null) {
            requestPermissions();
        }
    }
    
    /**
     * If any permissions the Contacts app needs are missing, open an Activity
     * to prompt the user for these permissions. Moreover, finish the current activity.
     *
     * This is designed to be called inside {@link Activity#onCreate}
     */
     protected static boolean startPermissionActivity(Activity activity,
                                                     String[] requiredPermissions, Class<?> newActivityClass) {
         if (!hasPermissions(activity, requiredPermissions)) {
            final Intent intent = new Intent(activity,  newActivityClass);
            activity.getIntent().putExtra(STARTED_PERMISSIONS_ACTIVITY, true);
            intent.putExtra(PREVIOUS_ACTIVITY_INTENT, activity.getIntent());
            activity.startActivity(intent);
            activity.finish();
            return true;
        }
        
        return false;
    }
    
    protected boolean isAllGranted(String permissions[], int[] grantResult) {
        for (int i = 0; i < permissions.length; i++) {
            if (grantResult[i] != PackageManager.PERMISSION_GRANTED
                    && isPermissionRequired(permissions[i])) {
                return false;
            }
        }
        return true;
    }
    
    private boolean isPermissionRequired(String p) {
        return Arrays.asList(getRequiredPermissions()).contains(p);
    }
    
    private void requestPermissions() {
        Trace.beginSection("requestPermissions");
        try {
            // Construct a list of missing permissions
            final ArrayList<String> unsatisfiedPermissions = new ArrayList<>();
            for (String permission : getDesiredPermissions()) {
                if (checkSelfPermission(permission)
                        != PackageManager.PERMISSION_GRANTED) {
                    unsatisfiedPermissions.add(permission);
                }
            }
            if (unsatisfiedPermissions.size() == 0) {
                throw new RuntimeException("Request permission activity was called even"
                        + " though all permissions are satisfied.");
            }
            ActivityCompat.requestPermissions(
                    this,
                    unsatisfiedPermissions.toArray(new String[unsatisfiedPermissions.size()]),
                    PERMISSIONS_REQUEST_ALL_PERMISSIONS);
        } finally {
            Trace.endSection();
        }
    }
    
    @Override
    public int checkSelfPermission(String permission) {
        return ContextCompat.checkSelfPermission(this, permission);
    }
    
    protected static boolean hasPermissions(Context context, String[] permissions) {
        Trace.beginSection("hasPermission");
        try {
            for (String permission : permissions) {
                if (ContextCompat.checkSelfPermission(context, permission)
                        != PackageManager.PERMISSION_GRANTED) {
                    return false;
                }
            }
            return true;
        } finally {
            Trace.endSection();
        }
    }
}

子类文件RequestPermissionsActivity：

package com.android.face.permission;

import android.Manifest.permission;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;

/**
 * Activity that requests permissions needed for activities exported from Contacts.
 */
public class RequestPermissionsActivity extends RequestPermissionsActivityBase {
    private static final String[] REQUIRED_PERMISSIONS = new String[]{
            permission.CALL_PHONE,
            permission.READ_PHONE_STATE,
            permission.READ_CONTACTS,
            permission.ACCESS_COARSE_LOCATION,
            permission.WRITE_EXTERNAL_STORAGE,
            permission.READ_EXTERNAL_STORAGE,
            permission.CAMERA,
            permission.RECORD_AUDIO
    };
    
    @Override
    protected String[] getRequiredPermissions() {
        return REQUIRED_PERMISSIONS;
    }

    @Override
    protected String[] getDesiredPermissions() {
        return REQUIRED_PERMISSIONS;
    }
    
    public static boolean startPermissionActivity(Activity activity) {
        return startPermissionActivity(activity, REQUIRED_PERMISSIONS,
                RequestPermissionsActivity.class);
    }
    
    @Override
    public void onRequestPermissionsResult(
            int requestCode, String permissions[], int[] grantResults) {
        if (permissions != null && permissions.length > 0
                && isAllGranted(permissions, grantResults)) {
            mPreviousActivityIntent.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
            startActivity(mPreviousActivityIntent);
            finish();
            overridePendingTransition(0, 0);
        } else {
            //Toast.makeText(this, R.string.missing_required_permission, Toast.LENGTH_SHORT).show();
            finish();
        }
    }
    
    /**
     * M: Add for check basic permissions state.
     */
    public static boolean hasBasicPermissions(Context context) {
        return hasPermissions(context, REQUIRED_PERMISSIONS);
    }
}

然后只要在Activity类中的方法onCreate开始部分调用：

if (RequestPermissionsActivity.startPermissionActivity(this)) {
    return;
}

将上面两个类代码copy到文件，然后如上调用一把，再将需要的权限申请写到RequestPermissionsActivity类的数组REQUIRED_PERMISSIONS中，最后还需要将对应的权限申请配置在AndroidManifest.xml文件中。

按照上面步骤做一遍，运行应用就会弹出权限界面了。