共享意图应检查 textview 是否为空

Question

我在我的应用程序中实现了共享意图按钮。我在文本视图中有字符串，但它并不总是填充任何文本。所以，我想检查它是否为空。如果字符串为空，则共享意图应忽略/删除/获取该字符串并转到下一个字符串。我尝试以编程方式执行此操作，但没有成功。我怎样才能做到这一点？我需要一些帮助：

public void buttonClick2(View view) {


            TextView textView1 = (TextView)findViewById(R.id.word);
            TextView textView2 = (TextView)findViewById(R.id.definition);
            TextView textView3 = (TextView)findViewById(R.id.definition2);
            TextView textView4 = (TextView)findViewById(R.id.definition3);




            boolean hasDefinition2 = false;
        if (textView3 !=null){
            String text3 = textView3.getText().toString();
            if(text3 !=null && !text3.isEmpty()){
                hasDefinition2 = true;
            }
        }

        String def2 ="";
        if(hasDefinition2){
            def2 +="\n Definition 2: "+textView3.getText().toString();
        }


        boolean hasDefinition3 = false;
        if (textView4 !=null){
            String text4 = textView4.getText().toString();
            if(text4 !=null && !text4.isEmpty()){
                hasDefinition3 = true;
            }
        }

        String def3 ="";
        if(hasDefinition3){
            def3 +="\n Definition 3: "+textView4.getText().toString();
        }   
            Intent shareIntent1 = new Intent(android.content.Intent.ACTION_SEND);
            shareIntent1.setAction(android.content.Intent.ACTION_SEND);
            shareIntent1.setType("text/plain");
            shareIntent1.putExtra(android.content.Intent.EXTRA_SUBJECT, "Word"); //<=adding blank quotes

            shareIntent1.putExtra(Intent.EXTRA_TEXT, textView1.getText().toString()+
                    "\n"+Definition: +textView2.getText().toString()+
                    "\n"+def2+
                    "\n"+def3+
                    "\n"+"\n"+"@2016 Dictionary"+
                    "\n"+"Visit us:");    
            startActivity(Intent.createChooser(shareIntent1, "Share"));





        }

Answer 1

您可以尝试以下方法来检查 textView3/4 是否为空：-

String extra =textView1.getText().toString()+
                "\n"+Definition: +textView2.getText().toString(); 

if (textView3 !=null){
    String text = textView3.getText().toString();
    if(text !=null && !text.isEmpty()){
        extra +="\n Definition 2:"+ textView3.getText().toString(); 
    }
}

if (textView4 !=null){
    String text = textView4.getText().toString();
    if(text !=null && !text.isEmpty()){ 
       extra +="\n Definition 3:"+ textView4.getText().toString();
    }
} 

extra += "\n"+"\n"+"@2016 Dictionary"+
         "\n"+"Visit us:"

shareIntent.putExtra(Intent.EXTRA_TEXT, extra);
startActivity( ... )

也可以考虑使用 StringBuilder 而不是 String 来做额外的。