Starting intent from onclicklistener

问题:

I am trying to start a new activity from a custom onclick listener. But its unable to access MainActivity instance from onclick listener. Also, its showing wrong constructor for intent. Here is my code:

public class ChartClickListener implements OnClickListener {
    private String ChartLink;
    public ChartClickListener(String chartLink){
        this.ChartLink=chartLink;
    }
    @Override
    public void onClick(View view) {
        // TODO Auto-generated method stub
        Intent intent=new Intent(MainActivity.this,ChartImageActivity.class);
        intent.putExtra("chartLink", ChartLink);
        startActivity(intent);
    }
}

Thanks for the help in advance.

回答1:

Modify your code as:

@Override
    public void onClick(View view) {
        // TODO Auto-generated method stub
        Intent intent=new Intent(view.getContext(),ChartImageActivity.class);
        intent.putExtra("chartLink", ChartLink);
        startActivity(intent);
    }

回答2:

try like this

@Override
    public void onClick(View view) {
        // TODO Auto-generated method stub
        Intent intent=new Intent(view.getContext(),ChartImageActivity.class);
        intent.putExtra("chartLink", ChartLink);
        view.getContext().startActivity(intent);//Changed Here
    }

Hope It will work

回答3:

pass activity context to custom onclick listener and use that context to startactivity

 public class ChartClickListener implements OnClickListener {
    private String ChartLink;
    Context c;
    public ChartClickListener(String chartLink,Context context){
        this.ChartLink=chartLink;
        this.c=context;
    }
    @Override
    public void onClick(View view) {
        // TODO Auto-generated method stub
        Intent intent=new Intent(c,ChartImageActivity.class);
        intent.putExtra("chartLink", ChartLink);
        c.startActivity(intent);
    }

}

set setOnClickListener as

ChartClickListener chartclicklistener=new ChartClickListener("chartLink",MainActivity.this);
b.setOnClickListener(chartclicklistener);

回答4:

Replace MainActivity.this with view.getContext() and it will work.

回答5:

I try this and it work, i want to show a Toast, and then transfer to a new Activity.

public class NumbersClickListener implements View.OnClickListener {

@Override
public void onClick(View view){
    Toast.makeText(view.getContext(),"Open the list of Numbers",Toast.LENGTH_SHORT).show();
    switch (view.getId()){
        case R.id.numbers:
            Intent i  = new Intent(view.getContext(), NumberActivity.class);
            view.getContext().startActivity(i);
            break;
        case R.id.family:
            Intent   i2  = new Intent(view.getContext(),FamilyActivity.class);
            view.getContext().startActivity(i2);
            break;
        case R.id.colors:
            Intent  i3  = new Intent(view.getContext(),ColorsActivity.class);
            view.getContext().startActivity(i3);
            break;
        case R.id.phrases:
            Intent  i4  = new Intent(view.getContext(),PhrasesActivity.class);
            view.getContext().startActivity(i4);
            break;

    }

}

}