Android 单击FAB时添加视图

我的应用程序有一个线性布局

每当我单击浮动操作按钮（FAB）时，我希望将文本视图添加到此布局

---

另外，如何编辑视图的不同参数，如文本、颜色、大小等？

不必这样做，只需在LinearLayout中添加一个TextView并将其可见性设置为GONE即可

在你的内心深处

textView.setVisibility(View.VISIBLE);

---

要保存活动状态。。。 1> 我们需要TextView和一个布尔值来存储它的值

public class MainActivity extends AppCompatActivity{

     TextView textView;    
     Boolean isTextViewVisible = true;   

     
     @Override
     protected void onCreate(Bundle savedInstanceState) {
          {...}
          textView = (TextView) findViewById(R.id.textViewID);
          {...}
     }
}

2> 隐藏/显示文本视图的步骤

{ 
    // inside any method....
    textView.setVisiblity(View.GONE);
    isTextViewVisible = false;     // because it is not visible!!!
}

3> 存储活动状态

@Override
protected void onCreate(Bundle savedInstanceState) {
    
    {...}

    textView = (TextView) findViewById(R.id.textView);

    if (savedInstanceState != null) {     // if savedInstanceState is not null...
        isTextViewVisible = savedInstanceState.getBoolean("isVisible");  
       
        // It will set value for isTextViewVisible boolean from previous state

        if (isTextViewVisible == false){

            textView.setVisibility(View.GONE);
        }
    }

    {...}
}

我们需要

onSaveInstanceState

方法，所以按Ctrl+o并搜索它，然后添加它

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);

    outState.putBoolean("isVisible", isTextViewVisible);  // storing value...
} 

4> 恢复活动状态

@Override
protected void onCreate(Bundle savedInstanceState) {
    
    {...}

    textView = (TextView) findViewById(R.id.textView);

    if (savedInstanceState != null) {     // if savedInstanceState is not null...
        isTextViewVisible = savedInstanceState.getBoolean("isVisible");  
       
        // It will set value for isTextViewVisible boolean from previous state

        if (isTextViewVisible == false){

            textView.setVisibility(View.GONE);
        }
    }

    {...}
}

---

要了解更多详细信息，只需在LinearLayout中添加一个TextView，并将其可见性设置为GONE即可

在你的内心深处

textView.setVisibility(View.VISIBLE);

---

要保存活动状态。。。 1> 我们需要TextView和一个布尔值来存储它的值

public class MainActivity extends AppCompatActivity{

     TextView textView;    
     Boolean isTextViewVisible = true;   

     
     @Override
     protected void onCreate(Bundle savedInstanceState) {
          {...}
          textView = (TextView) findViewById(R.id.textViewID);
          {...}
     }
}

2> 隐藏/显示文本视图的步骤

{ 
    // inside any method....
    textView.setVisiblity(View.GONE);
    isTextViewVisible = false;     // because it is not visible!!!
}

3> 存储活动状态

@Override
protected void onCreate(Bundle savedInstanceState) {
    
    {...}

    textView = (TextView) findViewById(R.id.textView);

    if (savedInstanceState != null) {     // if savedInstanceState is not null...
        isTextViewVisible = savedInstanceState.getBoolean("isVisible");  
       
        // It will set value for isTextViewVisible boolean from previous state

        if (isTextViewVisible == false){

            textView.setVisibility(View.GONE);
        }
    }

    {...}
}

我们需要

onSaveInstanceState

方法，所以按Ctrl+o并搜索它，然后添加它

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);

    outState.putBoolean("isVisible", isTextViewVisible);  // storing value...
} 

4> 恢复活动状态

@Override
protected void onCreate(Bundle savedInstanceState) {
    
    {...}

    textView = (TextView) findViewById(R.id.textView);

    if (savedInstanceState != null) {     // if savedInstanceState is not null...
        isTextViewVisible = savedInstanceState.getBoolean("isVisible");  
       
        // It will set value for isTextViewVisible boolean from previous state

        if (isTextViewVisible == false){

            textView.setVisibility(View.GONE);
        }
    }

    {...}
}

---

有关详细信息

如果要动态添加多个文本视图，请尝试以下操作：

    //you can dynamically change text size and color of this view.
    TextView textView = new TextView(this);

    //change margins according to your need.
    int marginLeft = 0 ,marginRight = 0 ,marginTop = 0 ,marginBottom = 0;
    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT);
    layoutParams.setMargins(marginLeft,marginTop,marginRight,marginBottom);
    textView.setLayoutParams(layoutParams);

    yourLinearLayout.addView(textView);

---

希望这有帮助。

如果要动态添加多个文本视图，请尝试以下操作：

    //you can dynamically change text size and color of this view.
    TextView textView = new TextView(this);

    //change margins according to your need.
    int marginLeft = 0 ,marginRight = 0 ,marginTop = 0 ,marginBottom = 0;
    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT);
    layoutParams.setMargins(marginLeft,marginTop,marginRight,marginBottom);
    textView.setLayoutParams(layoutParams);

    yourLinearLayout.addView(textView);

---

希望这有帮助。

谢谢，但有一件事，当我重新启动应用程序时，所有内容都再次设置为不可见。我如何使这些更改永久化，以便它们保持原样，并且在我再次运行应用程序时不会消失。不过，感谢您，当我重新启动应用程序时，所有内容都再次设置为不可见。我如何使这些更改永久化，以便它们保持原样，并且在我再次运行应用程序时不会消失。