をプログラムI、プログラム<code>android.support.v7.widget.SwitchCompat</code>を追加しようとしていると私はこのエラーを取得してい

Question

をエラー：

java.lang.NullPointerException: Attempt to invoke interface method 'int java.lang.CharSequence.length()' on a null object reference 
                      at android.text.StaticLayout.<init>(StaticLayout.java:422) 
                      at android.support.v7.widget.SwitchCompat.makeLayout(SwitchCompat.java:602) 
                      at android.support.v7.widget.SwitchCompat.onMeasure(SwitchCompat.java:526) 
                      at android.view.View.measure(View.java:18799) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                      at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1458) 
                      at android.widget.LinearLayout.measureVertical(LinearLayout.java:746) 
                      at android.widget.LinearLayout.onMeasure(LinearLayout.java:629) 
                      at android.view.View.measure(View.java:18799) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                      at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1458) 
                      at android.widget.LinearLayout.measureVertical(LinearLayout.java:746) 
                      at android.widget.LinearLayout.onMeasure(LinearLayout.java:629) 
                      at android.view.View.measure(View.java:18799) 
                      at android.support.v7.widget.Toolbar.measureChildCollapseMargins(Toolbar.java:1218) 
                      at android.support.v7.widget.Toolbar.onMeasure(Toolbar.java:1326) 
                      at android.view.View.measure(View.java:18799) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                      at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1458) 
                      at android.widget.LinearLayout.measureVertical(LinearLayout.java:746) 
                      at android.widget.LinearLayout.onMeasure(LinearLayout.java:629) 
                      at android.support.design.widget.AppBarLayout.onMeasure(AppBarLayout.java:199) 
                      at android.view.View.measure(View.java:18799) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                      at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:668) 
                      at android.support.design.widget.AppBarLayout$Behavior.onMeasureChild(AppBarLayout.java:888) 
                      at android.support.design.widget.AppBarLayout$Behavior.onMeasureChild(AppBarLayout.java:652) 
                      at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:733) 
                      at android.view.View.measure(View.java:18799) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                      at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
                      at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) 
                      at android.view.View.measure(View.java:18799) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                      at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1458) 
                      at android.widget.LinearLayout.measureVertical(LinearLayout.java:746) 
                      at android.widget.LinearLayout.onMeasure(LinearLayout.java:629) 
                      at android.view.View.measure(View.java:18799) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                      at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
                      at android.view.View.measure(View.java:18799) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                      at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1458) 
                      at android.widget.LinearLayout.measureVertical(LinearLayout.java:746) 
                      at android.widget.LinearLayout.onMeasure(LinearLayout.java:629) 
                      at android.view.View.measure(View.java:18799) 
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                      at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
                      at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2899) 
                      at android.view.View.measure(View.java:18799) 
                      at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2108) 
                      at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1224) 
                      at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1460) 
                      at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1115) 
                      at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6023) 
                     at android.view.Choreographer$CallbackRecord.run(Chore 

が、私はSwitchすべてを使用していokです。なぜこうなった？これは私のコードです：

SwitchCompat switchBox = (SwitchCompat) LayoutInflater.from(getApplicationContext()).inflate(R.layout.checkbox, null); 
switchBox.setId(i); 
Typeface typeface = Typeface.createFromAsset(getAssets(), "iransansfont.ttf"); 
switchBox.setText(convert_num((nodesModelArrayList.get(i).type ? "بیمارستان " : "مطب ") + nodesModelArrayList.get(i).node_name + ": " + nodesModelArrayList.get(i).stat)); 
switchBox.setTypeface(typeface); 
switchBox.setOnCheckedChangeListener(onCheckedChangeListener); 
linearLayout.addView(switchBox); 
switchBox.setChecked(true); 

Answer 1

ビューを拡張するためのアプリケーションコンテキストではなくアクティビティコンテキストを使用してください。テーマが機能する。

クラッシュは、通常、テーマからデフォルト値を取得するtextOnとtextOffのラベルがnullであるためです。