Question

已经研究了一段时间，似乎无法找到任何解决方案。我有一个5页图像采用PagerLayout滑动格式。我想要做的是点击图片，我想去另一个XML文件/类。

代码:(我已经评论过我尝试过的方法。）

public class CustomSwipeAdapter extends PagerAdapter {
    Context context;
    private int[] image_resources = {R.drawable.chestpress,R.drawable.deadlift,R.drawable.squat,R.drawable.pullups,R.drawable.dips};
    private Context ctx; //Gets the context of a current state or application. Tells program what is going on somewhere else.
    private LayoutInflater layoutInflater;  //USed to instantiate layout XML files to View Objct.
    private LayoutInflater inflater;
    private String[] names = {"Dumbell Press","Deadlift","Squats","Pullups","Tricep Dips"};
    public ImageView imageView;
    Activity activity;
    View views = null;


    public CustomSwipeAdapter(Context ctx){
        this.ctx = ctx;
    }


    @Override
    public int getCount() {
        return image_resources.length;
    }

    @Override
    public boolean isViewFromObject(View view, Object o) {
        return view==(LinearLayout)o;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        inflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        layoutInflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View item_view = layoutInflater.inflate(R.layout.swipe_layout,container,false);
        imageView = (ImageView)item_view.findViewById(R.id.image_view);
        TextView textView = (TextView)item_view.findViewById(R.id.image_count);
        imageView.setImageResource(image_resources[position]);
        textView.setText(names[position]);
        container.addView(item_view);


        imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(position == 0) {
                    Log.d("Exercise","Dumbell Press");
                    //Intent intent = new Intent(ctx,MyActivity.class);
                    //Intent intent = new Intent(CustomSwipeAdapter.this,MyActivity.class);
                    //Intent intent = new Intent(context,MyActivity.class);
                    //views = inflater.inflate(R.layout.main,null);
                    //context.startActivity(intent);
                    //MyActivity koo = new MyActivity(); (Tried just instantiating another class (Im so lost) 

                }
                if(position == 1){
                    Log.d("Exercise","Deadlift!");
                }
                if(position == 2){
                    Log.d("Exercise","Squats");
                }
            }
        });

        return item_view;
    }




    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((LinearLayout)object);
    }
}

非常新的android / java程序员。谢谢你的阅读。

Answer 1

试试这个：

Intent intent = new Intent(CustomSwipeAdapter.this.ctx, MyActivity.class);
CustomSwipeAdapter.this.ctx.startActivity(intent);

还要确保将正确的上下文传递给Adapter构造函数。您将传递的上下文可以是活动本身。

因此，在您的Activity上，当您需要创建新适配器时，请执行以下操作：

CustomSwipeAdapter myAdapter = new CustomSwipeAdapter(this);

其中this是您要在其上创建适配器的活动。如果需要在片段内创建适配器，只需使用以下命令获取活动：

MyFragment.getActivity();

最后，如果你想知道：＆＃34;为什么会这样？它期望一个Context和我传递一个活动！＆＃34;。

这是一个简短的回答：

活动继承上下文。因此，如果您正在参加某项活动，则只能参加需要传递自己来使用上下文。它还包含一个指针 getBaseContext（）。您可能偶尔需要参考，如果你需要整个应用程序的上下文，但很可能你不会一会儿。

希望这会有所帮助。如果您再收到任何错误，请告诉我（不要忘记发布您的logcat，以便我们为您提供更好的帮助）。

Answer 2

理想情况下你应该做的就是这个，

1：创建一个名为public class CustomSwipeAdapter extends PagerAdapter { Context context; private int[] image_resources = {R.drawable.chestpress, R.drawable.deadlift, R.drawable.squat, R.drawable.pullups, R.drawable.dips}; private Context ctx; //Gets the context of a current state or application. Tells program what is going on somewhere else. private LayoutInflater layoutInflater; //USed to instantiate layout XML files to View Objct. private LayoutInflater inflater; private String[] names = {"Dumbell Press", "Deadlift", "Squats", "Pullups", "Tricep Dips"}; public ImageView imageView; Activity activity; View views = null; private swipeAdapterCallback mCallback; public CustomSwipeAdapter(Context ctx,swipeAdapterCallback callback) { this.ctx = ctx; this.mCallback = callback; } @Override public int getCount() { return image_resources.length; } @Override public boolean isViewFromObject(View view, Object o) { return view == (LinearLayout) o; } @Override public Object instantiateItem(ViewGroup container, final int position) { inflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE); layoutInflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View item_view = layoutInflater.inflate(R.layout.swipe_layout, container, false); imageView = (ImageView) item_view.findViewById(R.id.image_view); TextView textView = (TextView) item_view.findViewById(R.id.image_count); imageView.setImageResource(image_resources[position]); textView.setText(names[position]); container.addView(item_view); imageView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { mCallback.onImageClick(position); } }); return item_view; } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((LinearLayout) object); } public interface swipeAdapterCallback { void onImageClick(int position); } }之类的接口，声明一个处理onClick的方法

2：确保在构造函数中获取swipeAdapterCallback实例。

3：然后你要做的就是调用回调实例中的onClick方法。

我在这里发布了适配器代码：

    @Override
    public void onImageClick(int position) {
        //handle intents and launching activities here.
        switch(position){
            case 0:
                Log.d("Exercise","Dumbell Press");
                Intent intent = new Intent(this,exampleAcitivity.class);
                startActivity(intent);
                break;
            case 1:
                Log.d("Exercise","Deadlift!");
                break;
            case 3:
                Log.d("Exercise","Squats");
                break;
        }
    }

然后在您的活动中，您所做的是实现此接口并在onImageClick函数中处理onClick，如此

    Add-Type -AssemblyName System.Windows.Forms
    $Form = New-Object system.Windows.Forms.Form
    $Form.Text = 'ALERT!'
    $form.ControlBox = $false; 
    $Image = [system.drawing.image]::FromFile('\\filepath') 
    $Form.BackgroundImage = $Image 
    $Form.BackgroundImageLayout = 'Stretch'
    $Form.Width = (680)
    $Form.Height = (550) 
    $OKButton = New-Object System.Windows.Forms.Button 
    $OKButton.Location = New-Object System.Drawing.Size(500,445) 
    $OKButton.Size = New-Object System.Drawing.Size(100,50) 
    $OKButton.Text = 'Accept'
    $OKButton.Font = New-Object System.Drawing.Font('Times New Roman',18) 
    $OKButton.Add_Click({$Form.Close()}) 
    $Form.Controls.Add($OKButton) 
    $Form.Add_Shown({$Form.Activate()}) 
    [void] $Form.ShowDialog()

由于这段代码将在您的Activity类中创建意图并开始新活动，因此处理这些活动的结果变得非常简单

ImageButton onclick在PagerAdapter中。需要转到另一个类/ XML文件。错误

2 个答案: