Android之查看签名的命令和SharedPreferences以及ContentProvider使用

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自己的签名查看签名信息

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应用包解析查看xxx.RSA中可以看到签名信息

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   /**         * SharePreferences         */        SharedPreferences sp = this.getSharedPreferences("bn", Context.MODE_PRIVATE);        String lastLoginTime=sp.getString("time",null);        if (lastLoginTime == null) {            lastLoginTime = "用户你好，欢迎第一次登陆";        } else {            lastLoginTime = "用户您好，您上次登陆的时间为：" + lastLoginTime;        }        SharedPreferences.Editor editor = sp.edit();        editor.putString("time", new Date().toLocaleString());        editor.commit();        textView2.setText(lastLoginTime);

ContentProvider

public class SimpleActivity extends AppCompatActivity {    ContentResolver cr;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_simple);        ButterKnife.bind(this);        cr = this.getContentResolver();//获取ContentResolver对象        Cursor cursor = cr.query(Uri.parse("content://com.android.contacts/contacts"),              null,               null,              null,               null        );        StringBuilder sb = new StringBuilder();        while (cursor.moveToNext()) {            //获取联系人姓名            String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));            String name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));            sb.append("contactId=").append(contactId).append(",name=").append(name);        //获取联系人手机号码            Cursor phnones = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,                    null,                    ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=" + contactId,                    null,                    null            );            while (phnones.moveToNext()) {                String phone = phnones.getString(phnones.getColumnIndex("data1"));                sb.append(",phone=").append(phone);            }        }        Log.i(TAG, "onCreate: "+sb.toString());        cursor.close();    }    public static final String TAG = SimpleActivity.class.getSimpleName();}

权限

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

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