Question

我最终遇到了一个奇怪的错误，即android LiveWallpaper catch。当我设置这个它适用于大约2.3的API：

    Canvas canvas = null;
    //Keep trying till wallpaper is set.
    //Error around here..
    try 
    {
        canvas = this._surfaceHolder.lockCanvas(null);
        synchronized (this._surfaceHolder) 
        {
            this.onDraw(canvas);
        }
    } 

    finally
    {
        if(canvas != null)
        {
            this._surfaceHolder.unlockCanvasAndPost(canvas);
        }
    }

这适用于ICS＆amp; Honeycomb（在真实设备上测试）

    Canvas canvas = null;
    //Keep trying till wallpaper is set.
    //Error around here..
    try 
    {
        canvas = this._surfaceHolder.lockCanvas(null);
        synchronized (this._surfaceHolder) 
        {
            this.onDraw(canvas);
        }
    } 

    finally
    {
        if(canvas != null)
        {
            this._surfaceHolder.unlockCanvasAndPost(canvas);
        }
    }

当livewallpaper为“Set”时会发生错误。（服务失败，“异常锁定服务”）如何从一次编译中获得它？我不想要两个不同的版本。

Answer 1

try catch的语法是：

try {
    // Code
} catch (<the Exception type to catch> ex) {
    // Exception handling code
} finally {
    // Code for after
}

注意：程序只会捕获您指定的异常。如果您未涵盖所有可能的例外情况，则不会处理。请参阅Oracle的Java教程中的catch blocks。

Answer 2

try catch的语法是尝试{

} catch {例外e） //捕获异常的代码最后} {

}

完全按照Java约定编写代码

奇怪的捕获尝试最后错误

2 个答案: