Question

我正在尝试显示自定义Toast，但是从我的自动化测试而不是应用程序本身这样做。

布局通胀不起作用。甚至可以对视图和测试项目进行膨胀并显示这些视图吗？

标准吐司是什么工作：

final Activity targetActivity = Solo.getCurrentActivity(); // Using Robotium to get current displayed Activity
Toast.makeText(targetActivity, "Hello from Instrumentation", Toast.LENGTH_SHORT).show();

什么不起作用如下：

final Activity targetActivity = Solo.getCurrentActivity(); // Using Robotium to get current displayed Activity

LayoutInflater inflater = targetActivity.getLayoutInflater();                         
View layout = inflater.inflate(test.my.package.R.layout.my_custom_toast, null); // resource is located in test project
TextView text = (TextView) layout.findViewById(test.my.package.R.id.textToShow); // textview within the layout

text.setText("Hello from Instrumentation"); // here I get the NullPointerException

Toast toast = new Toast(targetActivity);
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
toast.setDuration(Toast.LENGTH_LONG);
toast.setView(layout);
toast.show();

解决方案

在不参考LayoutInflater

的情况下获取新的targetActivity

final Activity targetActivity = Solo.getCurrentActivity(); // Using Robotium to get current displayed Activity

// *** !!! ***
LayoutInflater inflater = 
(LayoutInflater) getInstrumentation().getContext().getSystemService  (Context.LAYOUT_INFLATER_SERVICE); 
 // getContext() , NOT getTargetContext()

View layout = inflater.inflate(test.my.package.R.layout.my_custom_toast, null); // resource is located in test project
TextView text = (TextView) layout.findViewById(test.my.package.R.id.textToShow); // textview within the layout

text.setText("Hello from Instrumentation"); // here I get the NullPointerException

Toast toast = new Toast(targetActivity);
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
toast.setDuration(Toast.LENGTH_LONG);
toast.setView(layout);
toast.show();

Answer 1

您好使用以下代码：

import android.content.Context;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
import com.example.R;

public class DoToast extends Toast {

    /** The Constant TOAST_DURATION. */
    private static final int TOAST_DURATION=4000;

    /** The layout. */
    View layout; 

    /**
     * Instantiates a new do toast.
     *
     * @param context the context
     * @param text the text
     */
    public DoToast(Context context, CharSequence text) {
        super(context);

        LayoutInflater inflater = (LayoutInflater) context.getSystemService (Context.LAYOUT_INFLATER_SERVICE);
        layout = inflater.inflate(R.layout.toast, null);
        TextView textView = (TextView) layout.findViewById(R.id.text);
        textView.setText(text);
        DoToast.this.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
        DoToast.this.setDuration(TOAST_DURATION);
        DoToast.this.setView(layout);
        DoToast.this.show();
    }
}

布局xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/toast_layout_root"
     android:orientation="horizontal"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:padding="8dp"
     android:layout_marginLeft="10dp"
     android:layout_marginRight="10dp"
     android:background="@drawable/toast_bg">

     <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:textColor="#000000" />
</LinearLayout>

和样式文件：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
   android:shape="rectangle" >
   <gradient
        android:angle="90"
        android:endColor="#ffffff"
        android:startColor="#F2F2F2"
        android:type="linear" />
    <stroke
        android:width="3dp"
        android:color="#000000" />
</shape>

如果您需要显示吐司，请使用以下行：

new DoToast(this,"Testing");

如果您有任何疑问，请告诉我。

Answer 2

我认为问题与上下文有关，你试图从你的测试应用程序R文件中显示一个toast，但是通过一个活动使用应用程序上下文，你想要做的是从仪器获取测试上下文然后使用以下内容创建布局inflater。

 Context context = instrumentation.getContext();
 LayoutInflater li = LayoutInflater.from(context);

Android测试：从Instrumentation中充气并显示自定义Toast

2 个答案: