一.前言
(1).由于MIUI等部分国产定制系统也有权限管理，没有相关api，故无法判断用户是否允许获取联系人等隐私。在Android 6.0之后，新增权限管理可以通过官方api判断用户的运行状态；
(2).我们指定targetSdkVersion为23或者之后我们还需要在运行时请求这些所需的权限。这很重要，因为已经出现了很多开发者把targetSdkVersion飙到了最新，然后发现自己的app疯狂的崩溃，这是由于他们没有实现执行运行时权限请求的代码。当你已经把一个targeting API 为23或者之后的app发布到了Google Play上，这更是一个问题，你无法立即把那个apk的targeting API替换成更早的版本。
二.权限分析
从Android6.0开始，权限分为普通权限和许可权限。许可权限分类归组，一个权限授权之后，该组下的权限均可使用。
(1)普通权限
只需要在xml申请即可，使用方法和之前6.0以前的一样。在应用安装应用时，会默认获得许可。
(2)许可权限
可执行 $adb shell pm list permissions -d -g
同一组的任何一个权限被授权了，其他权限也自动被授权。例如，一旦WRITE_CONTACTS被授权了，app也有READ_CONTACTS和GET_ACCOUNTS了。
源码中被用来检查和请求权限的方法分别是Activity的checkSelfPermission和requestPermissions，这些方法api23引入。
三.相关方法
(1).ContextCompat.checkSelfPermission()
检查应用是否拥有该权限，被授权返回值为PERMISSION_GRANTED，否则返回PERMISSION_DENIED
(2).ActivityCompat.requestPermissions()
将弹出请求授权对话框，这个方法在M之前版本调用，OnRequestPermissionsResultCallback 直接被调用，带着正确的 PERMISSION_GRANTED或者 PERMISSION_DENIED 。
(3).AppCompatActivity.onRequestPermissionsResult()
该方法类似于Activity的OnActivityResult()的回调方法，主要接收请求授权的返回值
//版本判断
if (Build.VERSION.SDK_INT >= 23) {
//减少是否拥有权限
int checkCallPhonePermission = ContextCompat.checkSelfPermission(getApplicationContext(), permission);
if (checkCallPhonePermission != PackageManager.PERMISSION_GRANTED) {
//弹出对话框接收权限
ActivityCompat.requestPermissions(BaseActivity.this, new String[]{permission}, id);
return;
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//TODO:已授权
} else {
//TODO:用户拒绝
}
}
(4).封装
public class BaseActivity extends AppCompatActivity {
private Map<Integer, Runnable> allowablePermissionRunnables = new HashMap<>();
private Map<Integer, Runnable> disallowablePermissionRunnables = new HashMap<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
protected void requestPermission(int id, String permission, Runnable allowableRunnable, Runnable disallowableRunnable) {
if (allowableRunnable == null) {
throw new IllegalArgumentException("allowableRunnable == null");
}
allowablePermissionRunnables.put(id, allowableRunnable);
if (disallowableRunnable != null) {
disallowablePermissionRunnables.put(id, disallowableRunnable);
}
//版本判断
if (Build.VERSION.SDK_INT >= 23) {
//减少是否拥有权限
int checkCallPhonePermission = ContextCompat.checkSelfPermission(getApplicationContext(), permission);
if (checkCallPhonePermission != PackageManager.PERMISSION_GRANTED) {
//弹出对话框接收权限
ActivityCompat.requestPermissions(BaseActivity.this, new String[]{permission}, id);
return;
} else {
allowableRunnable.run();
}
} else {
allowableRunnable.run();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Runnable allowRun = allowablePermissionRunnables.get(requestCode);
allowRun.run();
} else {
Runnable disallowRun = disallowablePermissionRunnables.get(requestCode);
disallowRun.run();
}
}
}
public class MainActivity extends BaseActivity implements View.OnClickListener{
private Button btCallPhone;
private Button btContact;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btCallPhone = (Button) findViewById(R.id.call_phone);
btContact = (Button) findViewById(R.id.contact);
btCallPhone.setOnClickListener(this);
btContact.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if(v == btCallPhone){
//拨打电话
requestPermission(1, Manifest.permission.CALL_PHONE, new Runnable() {
@Override
public void run() {
callPhone();
}
}, new Runnable() {
@Override
public void run() {
callPhoneDenied();
}
});
}else if(v == btContact){
//读取联系人信息
requestPermission(2, Manifest.permission.WRITE_CONTACTS, new Runnable() {
@Override
public void run() {
readContact();
}
}, new Runnable() {
@Override
public void run() {
readContactDenied();
}
});
}
}
private void callPhone() {
Toast.makeText(MainActivity.this, "CALL_PHONE OK", Toast.LENGTH_SHORT)
.show();
}
private void callPhoneDenied() {
Toast.makeText(MainActivity.this, "CALL_PHONE Denied", Toast.LENGTH_SHORT)
.show();
}
private void readContact() {
ContentResolver cr = getContentResolver();
String str[] = {ContactsContract.CommonDataKinds.Phone.CONTACT_ID, ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME, ContactsContract.CommonDataKinds.Phone.NUMBER,
ContactsContract.CommonDataKinds.Phone.PHOTO_ID};
Cursor cur = cr.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI, str, null,
null, null);
int count = cur.getCount();
cur.close();
Toast.makeText(MainActivity.this, String.format("发现%s条", count), Toast.LENGTH_SHORT)
.show();
}
private void readContactDenied() {
Toast.makeText(MainActivity.this, "Contact Denied", Toast.LENGTH_SHORT)
.show();
}
}
