动态获取权限
2019-5-8 liuyingcong 安卓开发
以录音为例，演示一下Android中动态获取权限的过程：
首先在 AndroidManifest.xml 配置文件中添加权限请求：
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
下面是动态获取权限的代码：
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 以录音为例，演示动态获取权限的过程
// 当想要录音时，直接调用 checkPermission() 即可。如果已经有权限了，则直接去录音；如果没有，则去获取。
checkPermission();
}
// 检查是否有权限
private void checkPermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
// 已经有权限了，直接去录音
record();
} else {
// 还没获取权限，去获取
String[] permissions = {Manifest.permission.RECORD_AUDIO, Manifest.permission.WRITE_EXTERNAL_STORAGE};
ActivityCompat.requestPermissions(this, permissions, 100);
}
}
// 获取权限的结果
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 100) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
// 获取了两个权限，去录音
record();
} else {
if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.RECORD_AUDIO)
&& ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
// 拒绝了
Toast.makeText(this, "需要开启录音和存储权限，请重试", Toast.LENGTH_SHORT).show();
} else {
// 用户选择了拒绝后不再弹出
showDialog();
}
}
}
}
// 提示用户去设置中开启权限
private void showDialog() {
new AlertDialog.Builder(this)
.setTitle("未获取权限")
.setMessage("需要去设置中开启录音和存储权限")
.setPositiveButton("去开启", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent();
intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
Uri uri = Uri.fromParts("package", getPackageName(), null);
intent.setData(uri);
startActivityForResult(intent, 200);
}
}).setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
}).show();
}
// 去设置中开启权限的回调
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 200) {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
// 获取到权限了，去录音
record();
} else {
// 没获取到权限，提示
Toast.makeText(this, "请去设置中打开本应用的录音和存储权限", Toast.LENGTH_SHORT).show();
}
}
}
private void record() {
// 录音的代码
}
}