When a user touches a button in an application, the application often needs to start a UIAbility component to complete a specific task. If the **abilityName** and **bundleName** parameters are specified when starting a UIAbility, then the explicit Want is used. Using Explicit Want
When a user touches a button in an application, the application often needs to start a UIAbility component to complete a specific task. The following describes how to use explicit Want to start a UIAbility component in an application.
## How to Develop
1. In a project of the stage model, create an ability and a page, named **callerAbility** and **Index.ets**, respectively. Use the **windowStage.loadContent()** method in the **onWindowStageCreate** function in the **callerAbility.ts** file to bind the two.
```ts
// ...
// callerAbility.ts
onWindowStageCreate(windowStage){
// Main window is created, set main page for this ability
2. Repeat the preceding operation to create another ability named **calleeAbility**.
3. Add a button to the **Index.ets** page of **callerAbility**.
```ts
// ...
build(){
Row(){
Column(){
Text('hello')
.fontSize(50)
.fontWeight(FontWeight.Bold)
// A new button with will call explicitStartAbility() when clicked.
Button("CLICKME")
.onClick(this.explicitStartAbility)// For details about explicitStartAbility, see the sample code below.
// ...
}
.width('100%')
}
.height('100%')
}
// ...
```
4. Override the **onClick** method and use explicit Want to start **calleeAbility** in the method. The **bundleName** field can be obtained from the **AppScope > app.json5** file of the project. The **abilityName** field can be obtained from the **yourModuleName > src > main > module.json5** file of the corresponding module.
The user touches a button in the application to start the UIAbility component to complete a specific task. To start the UIAbility component in explicit Want mode, the **abilityName** and **bundleName** parameters must be specified. For details, see [Starting UIAbility in the Same Application](uiability-intra-device-interaction.md#starting-uiability-in-the-same-application).
