問題描述

我創(chuàng)建了一個(gè)自定義對(duì)話框，我想在單擊確定"時(shí)開始一個(gè)新活動(dòng).如何獲取上下文以將其設(shè)置為 Intent 構(gòu)造函數(shù)的第一個(gè)參數(shù)?

I created a custom dialog and I'd like to start a new activity when OK is clicked. How can I get the context to set it as first argument of my Intent constructor?

我可以使用 getContext() 創(chuàng)建意圖，但我不能調(diào)用 startActivity.我應(yīng)該將調(diào)用對(duì)話框的活動(dòng)傳遞給對(duì)話框的構(gòu)造函數(shù)嗎?是否是通過單擊對(duì)話框來啟動(dòng)活動(dòng)的常用方式?

I can create the intent using getContext(), but I can't call startActivity. Shall I pass the activity calling the dialog to the dialog's constructor? Is it the usual way to start an activity by clicking a dialog?

public class CustomDialog extends Dialog implements OnClickListener {
    Button okButton, cancelButton;

    public CustomDialog(Context context) {      
        super(context);     
        setContentView(R.layout.custom_dialog);
        okButton = (Button) findViewById(R.id.button_ok);
        okButton.setOnClickListener(this);
        cancelButton = (Button) findViewById(R.id.button_cancel);
        cancelButton.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {       
        if (v == cancelButton)
            dismiss();
        else {
            Intent i = new Intent(getContext(), ItemSelection.class);
            startActivity(i); //The method startActivity(Intent) is undefined for the type CustomDialog
        }
    }
}

推薦答案

public class CustomDialog extends Dialog implements OnClickListener {
  Button okButton, cancelButton;
  Activity mActivity;

  public CustomDialog(Activity activity) {      
    super(activity);
    mActivity = activity;
    setContentView(R.layout.custom_dialog);
    okButton = (Button) findViewById(R.id.button_ok);
    okButton.setOnClickListener(this);
    cancelButton = (Button) findViewById(R.id.button_cancel);
    cancelButton.setOnClickListener(this);
  }

  @Override
  public void onClick(View v) {       
    if (v == cancelButton)
        dismiss();
    else {
        Intent i = new Intent(mActivity, ItemSelection.class);
        mActivity.startActivity(i);
    }
  }
}

這篇關(guān)于如何從 Android 中的對(duì)話框啟動(dòng) Activity的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！