Question

我对应用程序开发很陌生，而且我很难理解如何制作可扩展的textView。我需要扩展下面的代码，该代码位于xml文件中：

<!-- Clickable title -->
<TextView   android:id="@+id/help_title_guest"
            //style="@style/title_help"
            android:text="Title"
            android:clickable="true"
            android:onClick="toggle_contents"/>

<!--content to hide/show -->
<TextView   android:id="@+id/txt_help_gest"
            //style="@style/txt_help"
            android:text="Content"/>

我需要展开help_title_guest，以便在按下help_title_guest后显示text_help来宾。链接到此xml文件的java类如下所示。

package com.example.expandinglists;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.Toast;

public class ThirdActivity extends Activity{

    private final String TAG = "DemoButton";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        //Remove TitleBar
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        //The line below sets the convas / area labelled as activity_main
        setContentView(R.layout.activity_third);

        // Remove notification bar.        
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setupMessageButton();

    }

//button Class
    private void setupMessageButton() {
        // Button Functionality
        //1. Get Reference to the button
        Button messageButton = (Button) findViewById(R.id.btnOnThird);



        //2. Button on Click Listener to run the button related code

        messageButton.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                //The text below displays a message saying that The button was clicked
                Log.i(TAG, "Application installed");
                Toast.makeText(ThirdActivity.this,"Application Installed",Toast.LENGTH_LONG).show();

                Intent startMain = new Intent(Intent.ACTION_MAIN);
                startMain.addCategory(Intent.CATEGORY_HOME);
                startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(startMain);

            }           
        });     
    }
//end of button class

}

非常感谢，

Ĵ

Answer 1

如果要在两个TextView之间切换，可以将它们水平放置在彼此旁边，并在VISIBLE和GONE之间切换可见性。 GONE可见性意味着它消失并且不占用空间，这会将第二个TextView放在其位置。

初学者 - 扩展文本视图

1 个答案: