android studio开发小笔记

1、点击空白处隐藏软键盘

 /*
   隐藏软键盘
   * */
    public boolean dispatchTouchEvent(MotionEvent ev) {
        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
            View v = getCurrentFocus();
            if (isShouldHideInput(v, ev)) {

                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                if (imm != null) {
                    imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
                }
            }
            return super.dispatchTouchEvent(ev);
        }

        if (getWindow().superDispatchTouchEvent(ev)) {
            return true;
        }
        return onTouchEvent(ev);
    }


    public  boolean isShouldHideInput(View v, MotionEvent event) {
        if (v != null && (v instanceof EditText)) {
            int[] leftTop = { 0, 0 };

            v.getLocationInWindow(leftTop);
            int left = leftTop[0];
            int top = leftTop[1];
            int bottom = top + v.getHeight();
            int right = left + v.getWidth();
            if (event.getX() > left && event.getX() < right
                    && event.getY() > top && event.getY() < bottom) {

            } else {
                return true;
            }
        }
        return false;
    }

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2、沉浸式状态栏

        //设置沉浸式状态栏 android 4.4 及以上支持
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            //透明状态栏
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            //透明导航栏
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
        }

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3、设置导航栏

xml代码：

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:background="#5caef9"
        android:minHeight="50dp"
        android:gravity="center"
        android:textAlignment="center"
        >
    </android.support.v7.widget.Toolbar>

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后台代码：

        //设置导航栏
      Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar1);//鑾峰彇椤甸潰鐨勫伐鍏锋爮

        toolbar.setTitle("设置服务");
        toolbar.setTitleMarginStart(370);
        toolbar.setTitleTextColor(Color.WHITE);
        toolbar.setTitleMarginTop(10);
        toolbar.setNavigationIcon(R.mipmap.allback);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(SettingServiceActivity.this,MyselfLoginActivity.class);
                startActivity(intent);
            }
        });

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4、获取屏幕宽高和设置控件宽高

        //设置输入框宽高
        EditText tvservicepath = (EditText)findViewById(R.id.tvservicepath);
        tvservicepath.setText(R.string.serverpath);//获取资源文件
        //获取屏幕高宽
        WindowManager wm = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics dm = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(dm);
        int width = dm.widthPixels;         // 屏幕宽度（像素）
        int height = dm.heightPixels;       // 屏幕高度（像素）
        float density = dm.density;         // 屏幕密度（0.75 / 1.0 / 1.5）
        int densityDpi = dm.densityDpi;     // 屏幕密度dpi（120 / 160 / 240）
        // 屏幕宽度算法:屏幕宽度（像素）/屏幕密度
        int screenWidth = (int) (width / density);  // 屏幕宽度(dp)
        int screenHeight = (int) (height / density);// 屏幕高度(dp)

        ViewGroup.LayoutParams para;
        para = tvservicepath.getLayoutParams();
        para.height = screenHeight/2;
        para.width = width-50;
        tvservicepath.setLayoutParams(para);

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