以编程方式将工具栏添加到Android中的RelativeView

我对android开发非常陌生，我正在尝试学习如何以编程方式将工具栏添加到相对视图。从本质上讲，我试图在代码中执行空白项目模板，而不是使用基于XML的方法。我的应用程序将启动，但我看到的是我添加的TextView，并没有看到工具栏或菜单膨胀，并放置在屏幕顶部的工具栏上。这里是我到目前为止的代码：以编程方式将工具栏添加到Android中的RelativeView

public class MainActivity extends AppCompatActivity { 
    private RelativeLayout relativeLayout; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     // Create the relative layout programmatically 
     createRelativeLayout(); 

     // Set the content view with the instantiated relative layout 
     setContentView(this.relativeLayout); 

     // Create and add the action bar 
     setSupportActionBar(createToolbar()); 

     // Create a text view and add it 
     this.relativeLayout.addView(createTextView()); 
    } 

    private void createRelativeLayout() { 
     relativeLayout = new RelativeLayout(this); 

     // Specifies the layout properties 
     RelativeLayout.LayoutParams relativeParams = new RelativeLayout.LayoutParams(
       RelativeLayout.LayoutParams.MATCH_PARENT, 
       RelativeLayout.LayoutParams.MATCH_PARENT 
     ); 
     relativeLayout.setLayoutParams(relativeParams); 
    } 

    private TextView createTextView() { 
     TextView textView = new TextView(this); 

     // Set initial layout parameters 
     RelativeLayout.LayoutParams textViewParams = new RelativeLayout.LayoutParams(
       RelativeLayout.LayoutParams.WRAP_CONTENT, 
       RelativeLayout.LayoutParams.WRAP_CONTENT 
     ); 

     // Set alignment parameters 
     textViewParams.addRule(RelativeLayout.ALIGN_PARENT_TOP); 
     textViewParams.addRule(RelativeLayout.CENTER_HORIZONTAL); 

     textViewParams.setMargins(0, 82, 0, 0); 
     textView.setText(R.string.app_name); 

     textView.setLayoutParams(textViewParams); 

     return textView; 
    } 

    private Toolbar createToolbar() { 
     Toolbar toolbar = new Toolbar(this); 
     Toolbar.LayoutParams toolBarParams = new Toolbar.LayoutParams(
       Toolbar.LayoutParams.MATCH_PARENT, 
       R.attr.actionBarSize 
     ); 
     toolbar.setLayoutParams(toolBarParams); 
     toolbar.setBackgroundColor(Color.BLUE); 
     toolbar.setPopupTheme(R.style.AppTheme_PopupOverlay); 
     toolbar.setVisibility(View.VISIBLE); 
     return toolbar; 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 
}

任何帮助，非常感谢，谢谢。

来源

2015-12-03 Swarthammer

答案很简单：添加视图时RelativeLayout

您已经分配了Toolbar.LayoutParams的布局PARAMS到工具栏中，您应该使用RelativeLayout.LayoutParams，除非你指定一个RelativeLayout.LayoutParams到工具栏将无法正常工作。

在android视图通货膨胀中，每个子视图的布局参数应根据其父项进行设置。如果您的工具栏例如在LinearLayout中，则应该使用“LinearLayout.LayoutParams”作为工具栏的布局参数。

来源

2015-12-03 01:27:17

以编程方式将工具栏添加到Android中的RelativeView

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