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Android 常用方法摘记

Android 常用方法摘记

作者: yangjianan | 来源:发表于2016-07-18 16:49 被阅读250次

调用系统方法,分享文本图片等(2016-12-06 19:16:43)

/**
 * Created by _SOLID
 * Date:2016/4/22
 * Time:12:45
 * https://github.com/burgessjp/GanHuoIO/blob/master/app/src/main/java/ren/solid/ganhuoio/utils/ShakePictureUtils.java
 */
public class SystemShareUtils {

    public static void shareText(Context ctx, String text) {
        Intent sendIntent = new Intent();
        sendIntent.setAction(Intent.ACTION_SEND);
        sendIntent.putExtra(Intent.EXTRA_TEXT, text);
        sendIntent.setType("text/plain");
        ctx.startActivity(Intent.createChooser(sendIntent, "分享至"));
    }

    public static void shareImage(Context ctx, Uri uri) {
        Intent sendIntent = new Intent();
        sendIntent.setAction(Intent.ACTION_SEND);
        sendIntent.putExtra(Intent.EXTRA_STREAM, uri);
        sendIntent.setType("image/jpeg");
        ctx.startActivity(Intent.createChooser(sendIntent, "分享至"));
    }

    public static void shareImageList(Context ctx, ArrayList<Uri> uris) {
        Intent sendIntent = new Intent();
        sendIntent.setAction(Intent.ACTION_SEND_MULTIPLE);
        sendIntent.putExtra(Intent.EXTRA_STREAM, uris);
        sendIntent.setType("image/*");
        ctx.startActivity(Intent.createChooser(sendIntent, "分享至"));
    }
}

Android调用微信扫一扫和支付宝扫一扫(2016-9-20 19:01:47)

摘自:习惯沉默的Blog

现在微信不能直接跳转到微信扫一扫:详见 Android调用微信扫一扫_CSDN

Gson构造JsonArray(2016-8-23 16:11:25)

最近项目中请求参数传参用到了 JsonArray对象
构造方法如下:

    Object[] object = new Object[]{"111", "222", "24G"};
    JsonArray jsonArr = new JsonArray();
    for (Object anObject : object) {
        JsonObject jo = new JsonObject(); //构造json
        jo.addProperty("offerCode", (String) anObject);
        jsonArr.add(jo);
    }
    Toast.makeText(this, "jsonArr:  " + jsonArr.toString(), Toast.LENGTH_SHORT).show();
    System.out.println("jsonArr:  " + jsonArr.toString());

访问或者下载单个github文件(2016-9-20 18:43:37)

用途:可以用来存一些配置文件,图片等.
url固定格式: https://raw.githubusercontent.com/username/repository/branch/filename
例如: https://raw.githubusercontent.com/yangxiaoge/MumuXi/master/README.md

参考stackoverflow:Download single files from GitHub

LICEcap录制Gif工具(2016-8-2 18:57:50)

官网地址

录制的gif图

读取Assets( 下面 cityId查询天气 中的是另一种读取方法)目录下文件(2016-06-12)

例如:

简书:http://www.jianshu.com/p/b87fee2f7a23

InputStreamReader isr = new InputStreamReader(this.getClass()
                    .getClassLoader()
                    .getResourceAsStream("assets/" + "student.json")
                    ,"utf-8"
                    );
//从assets获取json文件
BufferedReader bfr = new BufferedReader(isr);

cityId查询天气(2016-6-20 19:00:35)

  1. citycode.txt是cityid文件(数据 101190101=南京 )
  2. 下面代码是 逐行根据"="分隔符,读写城市id跟name,可以写到文件中
    /**
     * 根据城市名找到对应的id如果没有则说明在中国气象网不存在该城市
     *
     * @param cityname
     * @return
     */
    private String findId(String cityname) {
        if (null == cityname || "".equals(cityname))
            return null;
        try {
            InputStreamReader inputReader = new InputStreamReader(getResources().getAssets().open("citycode.txt"));
            BufferedReader bufReader = new BufferedReader(inputReader);
            String line = "";
            String[] str = new String[2];
            while ((line = bufReader.readLine()) != null) {
                str = line.split("=");
                if (str.length == 2 && null != str[1] && !"".equals(str[1]) && cityname.equals(str[1])) {
                    //返回对应city编号
                    return str[0];
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        return null;
    }

双击两次返回键退出 (2秒内退出)

private long exitTime = 0; // 返回键 退出时间
 /**
     *  返回键 (2秒内退出)
     * @param keyCode 返回键code
     * @param event keyEvent
     * @return true
     */
 @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {

        if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN) {
            //两秒之内按返回键就会退出
            if (System.currentTimeMillis() - exitTime > 2000) {
                Toast.makeText(this, "再按一次退出", Toast.LENGTH_SHORT).show();
                exitTime = System.currentTimeMillis();
            } else {
                finish();
            }
            return true; // 不要忘记 return true
        }

        return super.onKeyDown(keyCode, event);
}

下面是点击返回键 关闭DrawerLayout等等

/**
     * 系统返回键监听,事件处理
     * @return
     */
    @Override
    public void onBackPressed() {
        HomeViewPagerFragment homeFragment = null;
        boolean isDrawerOpen = false;
        boolean isPopFragment = false;
        String currentTabTag = mTabHost.getCurrentTabTag();

        String homeName = getResources().getString(MainTab.HOME.getResName());

        String bundleName = getResources().getString(MainTab.BUNDLES.getResName());

        String billName = getResources().getString(MainTab.BILL.getResName());

        if (currentTabTag.equals(bundleName)) {
            isPopFragment = ((BaseContainerFragment)getSupportFragmentManager().findFragmentByTag(bundleName)).popFragment();
        } else if (currentTabTag.equals(billName)) {
            isPopFragment = ((BaseContainerFragment)getSupportFragmentManager().findFragmentByTag(billName)).popFragment();
        }

        if(currentTabTag.equals(homeName)){
            homeFragment= ((HomeViewPagerFragment)getSupportFragmentManager().findFragmentByTag(homeName));
            isDrawerOpen = homeFragment.isDrawerOpen();
        }

        if(isDrawerOpen){
            homeFragment.closeDrawer();
        }else if(!isPopFragment){
            finish();
        }
}

RadioButton 点击事件 (2016-06-08)

借助ButterKnife快速实现

@OnCheckedChanged({R.id.searchRb1, R.id.searchRb2, R.id.searchRb3, R.id.searchRb4})
void onTagChecked(RadioButton searchRb, boolean checked) {
    if (checked) {
        //实现代码...
    }
}

夜神 模拟器连接(2016-6-22 13:44:46)

流畅度杠杆的!

adb connect 127.0.0.1:62001

Fiddler抓包设置: 具体参考👉trinea分享
1)

模拟器抓包配置
2)(实验证明已经不需要这一步了,只要设置好代理服务器主机名就行了!! add 2016-8-16 16:09:01) 模拟器浏览器打开: http://10.45.16.34:8888/(10.45.16.34就是本机地址, 所有模拟器都是这么访问)

海马玩 模拟器连接(2016-06-14)

http://www.jianshu.com/p/c2e6a4e7e9c4/comments/2742091#comment-2742091

adb connect 127.0.0.1:26944

抓包设置: 代理服务器主机名: 10.0.3.2 (genymotion也是这个), 夜神的是电脑ip

app启动页面(AlphaAnimation渐变) (2016-06-14)

效果图:

AlphaAnimation透明到不透明

完整代码如下↓↓↓↓↓↓

public class StartActivity extends AppCompatActivity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final View view = View.inflate(this, R.layout.activity_start, null);
        setContentView(view);
        // 渐变展示启动屏 , 0.0-1.0 透明到不透明
        AlphaAnimation aa = new AlphaAnimation(0.1f, 1.0f);
        aa.setDuration(3000);
        view.startAnimation(aa);
        aa.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationEnd(Animation animation) {
                // 动画结束跳转登陆界面
                redirectTo();
            }

            @Override
            public void onAnimationRepeat(Animation animation) {
            }

            @Override
            public void onAnimationStart(Animation animation) {
            }
        });
    }

    private void redirectTo() {
        Intent intent = new Intent(this, LoginActivity.class);
        startActivity(intent);
        finish();
    }
}

adapter中setTag()的使用

可以用来当前方法中传数据

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final ViewHolder holder;
        if (convertView == null) {
            holder = new ViewHolder();
            convertView = LayoutInflater.from(context).inflate(R.layout.temp, parent, false);
            holder.nameTv = (TextView) convertView.findViewById(R.id.name);
            holder.group = (RadioGroup) convertView.findViewById(R.id.group);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        HashMap<String, Object> map = getItem(position);
        map.put("position", position);
 --->   holder.group.setTag(map); // 通过group视图设置setTag(map)
        ...
        ...
        ...
 --->   HashMap<String, Object> radioMap = (HashMap<String, Object>) group.getTag(); // getTag()

Gson把JsonArray的字符串转成bean实体类

    String offerItemGroupStr;
    
    JsonArray array = (JsonArray) new JsonParser().parse(offerItemGroupStr);

    List<OfferItemGroup> offerDepGroupsList = new Gson().fromJson(array.toString(), new TypeToken<List<OfferItemGroup>>() {
        }.getType());

圆形进度条(2016-7-1 13:20:24)

Float Button 圆形进度条效果

week开源啦!! alibaba-week入口

保存图片到本地文件(2016-7-11 12:35:51)

参考: Mumuxi代码

/**
 * Created by allen on 2016/6/19.
 *
 *  Here reference is https://github.com/gaolonglong/GankGirl/blob/master/app/src/main/java/com/app/gaolonglong/gankgirl/util/ImageUtil.java
 */
public class ImgSaveUtil {

        public static Uri saveImage(Context context, String url, Bitmap bitmap, ImageView imageView, String tag){
            //妹纸保存路径
            String imgDir = Environment.getExternalStorageDirectory().getPath() + "/GankGirl";
            //图片名称处理
            String[] fileNameArr = url.substring(url.lastIndexOf("/") + 1).split("\\.");
            String fileName = fileNameArr[0] + ".png";
            //创建文件路径
            File fileDir = new File(imgDir);
            if (!fileDir.exists()){
                fileDir.mkdir();
            }
            //创建文件
            File imageFile = new File(fileDir,fileName);
            try {
                FileOutputStream fos = new FileOutputStream(imageFile);
                boolean compress = bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
                Snackbar.make(imageView,"妹纸已经躺在你的图库里啦.. ( ＞ω＜)", Snackbar.LENGTH_SHORT).show();

                fos.flush();
                fos.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

            Uri uri = Uri.fromFile(imageFile);
            //发送广播，通知图库更新
            context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,uri));
            return uri;
        }
}

样式统一设置 (2016-7-12 15:06:40)

例如:

 <!--全边框 输入框样式-->
    <style name="edittext_style">
        <item name="android:layout_width">match_parent</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:layout_marginLeft">@dimen/space_20</item>
        <item name="android:layout_marginRight">@dimen/space_20</item>
        <item name="android:layout_marginTop">@dimen/space_10</item>
        <item name="android:background">@drawable/input_bg</item>
        <item name="android:singleLine">true</item>
    </style>

    <!--只有底边边框 输入框样式-->
    <style name="edittext_style1" parent="edittext_style">
        <item name="android:background">?attr/editTextBackground</item>
    </style>

touch事件监听之tab页再次点击刷新数据 (2016-7-15 14:23:06)

具体可以看 开源中国源码: MainActivity中

 @Override
    public boolean onTouch(View v, MotionEvent event) {
        super.onTouchEvent(event);
        boolean consumed = false;
        // use getTabHost().getCurrentTabView to decide if the current tab is
        // touched again
        if (event.getAction() == MotionEvent.ACTION_DOWN
                && v.equals(mTabHost.getCurrentTabView())) {
            // use getTabHost().getCurrentView() to get a handle to the view
            // which is displayed in the tab - and to get this views context
            Fragment currentFragment = getCurrentFragment();
            if (currentFragment != null
                    && currentFragment instanceof OnTabReselectListener) {
                OnTabReselectListener listener = (OnTabReselectListener) currentFragment;
                listener.onTabReselect();
                consumed = true;
            }
        }
        return consumed;
    }

ProgressDialog使用:例如登录等待时 (2016-7-15 14:55:24)

下面的代码可以参考 Afrimax或者MPT的[BaseActivity](https://coding.net/u/yangxiaoge/p/AfrimaxMI/git/blob/master/app/src/main/java/com/ztesoft/zsmart/datamall/app/base/BaseActivity.java)

// =======================DIALOG_CONTROL_INTERFACE START========================

    // dialog 是否处于可见状态
    private boolean _isVisible;

    private ProgressDialog _waitDialog;

    @Override
    public void hideWaitDialog() {
        if (_isVisible && _waitDialog != null) {
            try {
                _waitDialog.dismiss();
                _waitDialog = null;
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

    @Override
    public ProgressDialog showWaitDialog() {
        return showWaitDialog(R.string.loading);
    }

    @Override
    public ProgressDialog showWaitDialog(int resid) {
        return showWaitDialog(getString(resid));
    }

    /**
     * 显示耗时操作等待弹出框
     *
     * @param message 提示消息
     * @return ProgressDialog
     */
    @Override
    public ProgressDialog showWaitDialog(String message) {
        if (_isVisible) {
            if (_waitDialog == null) {
                _waitDialog = DialogHelp.getWaitDialog(this, message);
            } else if (_waitDialog != null) {
                _waitDialog.setMessage(message);
            }
            _waitDialog.show();
            return _waitDialog;
        }
        return null;
    }


    // =======================DIALOG_CONTROL_INTERFACE END==========================

远程调试App或者WiFi调试(2016-7-19 19:34:09)

http://www.jianshu.com/p/e9c243b5060b

效果图

ScrollView初始化数据时不置顶(2016-7-20 16:36:01)

ScrollView布局设置一个属性即可!如果不设置,那么默认显示位置在ListView(等等..)底部
具体可以参考: ScrollView嵌套ListView不置顶显示

mScrollView.smoothScrollTo(0, 0);

使用BroadCast发送广播,通知home页刷新数据(2016-7-29 13:05:32)

 //----------------发送广播 , intent传值--------------//
 private void sendRefreshAccountBroadcast() {
        Intent intent = new Intent(Constants.REFRESH_HOME_ACCOUNT_LIST);
        intent.putExtra(Constants.REFRESH_HOME_ACCOUNT_LIST, true);
        getBaseContext().sendBroadcast(intent);
    }
    
    

//----------------------接收广播 start------------------//
 private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getBooleanExtra(Constants.REFRESH_HOME_ACCOUNT_LIST, false)) {
                // 刷新数据
                initExpendListViewData();
            }
        }
    };

    
@Override
public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 注册广播监听
        IntentFilter filter = new IntentFilter(Constants.REFRESH_HOME_ACCOUNT_LIST);
        getActivity().registerReceiver(mReceiver, filter);
    }
//-------------------接收广播 end------------------------//

EditText数据监听!登录模块,动态搜索模块等(2016-7-30 14:29:58)

    etUsertel.addTextChangedListener(new TextChange());
    etPassword.addTextChangedListener(new TextChange());

    // EditText监听器
    class TextChange implements TextWatcher {

        @Override
        public void afterTextChanged(Editable arg0) {

        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                int arg3) {

        }

        @Override
        public void onTextChanged(CharSequence cs, int start, int before,
                int count) {

            boolean Sign2 = et_usertel.getText().length() > 0;
            boolean Sign3 = et_password.getText().length() > 0;

            // 设置登录按钮的颜色,以及是否可点击!
            if (Sign2 & Sign3) {
                btnLogin.setTextColor(0xFFFFFFFF);
                btnLogin.setEnabled(true);
            }
            // 在layout文件中，对Button的text属性应预先设置默认值，否则刚打开程序的时候Button是无显示的
            else {
                btnLogin.setTextColor(0xFFD0EFC6);
                btnLogin.setEnabled(false);
            }
        }

    }

AS快捷键(2016-8-2 18:58:02)

android_studio快捷键

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网友评论

  • kidz:谢谢
    yangjianan:@kidz 多谢支持 :grin: ，我整理了些常用的，后面会继续补充！

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