android - 无法解析方法 'startActivity(android.content.Intent)'

Question

正如我给它起的标题一样，我收到一个无法识别 startActivity 的错误。这是代码:

AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setTitle("Deal");
builder.setMessage("Hello");
builder.setPositiveButton("Call ME", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {

        Intent callIntent = new Intent(Intent.ACTION_CALL);
        callIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        callIntent.setData(Uri.parse("tel:" + "528543871"));
        startActivity(callIntent);

    }
});
builder.create();
builder.show();

Answer 1

startActivity() 方法在上下文中被调用。当您将该方法调用到 onClick() 中时，这是 OnCLickListener 中的一个方法，因此该方法未解析。正如我在您的代码中看到的那样，您已经在 AlertDialog.Builder 构造函数中传递了 mContext，因此您还可以使用该 Context 变量来调用您的 startActivity() 方法。

AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setTitle("Deal");
builder.setMessage("Hello");
builder.setPositiveButton("Call ME", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {

        Intent callIntent = new Intent(Intent.ACTION_CALL);
        callIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        callIntent.setData(Uri.parse("tel:" + "528543871"));
        mContext.startActivity(callIntent); //Correct this line

    }
});
builder.create();
builder.show();

或

AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setTitle("Deal");
builder.setMessage("Hello");
builder.setPositiveButton("Call ME", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {

        Intent callIntent = new Intent(Intent.ACTION_CALL);
        callIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        callIntent.setData(Uri.parse("tel:" + "528543871"));
        getActivity().startActivity(callIntent);

    }
});
builder.create();
builder.show();