Android清单文件详解(二) ---- 应用程序权限声明（一）

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

public class MainActivity extends FragmentActivity {
    private static final String SDCARD= Environment.getExternalStorageDirectory()+File.separator;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        if(savedInstanceState==null){
            getSupportFragmentManager().beginTransaction().add(android.R.id.content,new FileFragment()).commit();
        }
    }
    public static class FileFragment extends Fragment {
        public FileFragment(){}
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View view=inflater.inflate(R.layout.file_fragment,container,false);
            Button mybut= (Button) view.findViewById(R.id.mybut);
            mybut.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    File sdcardFile=new File(SDCARD+"abc.txt");
                    try {
                        sdcardFile.createNewFile();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            });
            return view;
        }
    }
}

<permission android:description="string resource"
android:icon="drawable resource"
android:logo="drawable resource"
android:label="string resource"
android:name="string"
android:permissionGroup="string"
android:protectionLevel=["normal"|"dangerous"|"signature"|"signatureOrSystem"]/>

<permission 
android:name="com.android.launcher.permission.INSTALL_SHORT-CUT"
android:permissionGroup="android.permission-group.SYSTEM_TOOLS"
android:protectionLevel="normal"
android:label="@string/permlab_install_shortcut"
android:description="@string/perdesc_install_shortcut"/>