如何在Android中将一个TextView添加到LinearLayout中
如何在Android中将一个TextView添加到LinearLayout中
我正在尝试在代码中向我的xml定义的布局中添加TextViews。\n我有一个xml表格,其中定义了很多视图。但是我必须在代码中添加一些视图,所以我在xml表格中创建了一个LinearLayout:\n
问题的原因是在代码中没有定义linear这个LinearLayout对象,而却在最后使用了linear.addView(childLayout)这个方法。解决方法是在代码中添加linear这个LinearLayout对象的定义,可以通过以下方式进行修正:
LinearLayout linear = new LinearLayout(MainActivity.this); LinearLayout.LayoutParams params = new LinearLayout.LayoutParams( LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); linear.setLayoutParams(params); linear.setOrientation(LinearLayout.VERTICAL); for(int j=0;j<30;j++) { LinearLayout childLayout = new LinearLayout(MainActivity.this); LinearLayout.LayoutParams linearParams = new LinearLayout.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); childLayout.setLayoutParams(linearParams); TextView mType = new TextView(MainActivity.this); TextView mValue = new TextView(MainActivity.this); mType.setLayoutParams(new TableLayout.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1f)); mValue.setLayoutParams(new TableLayout.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1f)); mType.setTextSize(17); mType.setPadding(5, 3, 0, 3); mType.setTypeface(Typeface.DEFAULT_BOLD); mType.setGravity(Gravity.LEFT | Gravity.CENTER); mValue.setTextSize(16); mValue.setPadding(5, 3, 0, 3); mValue.setTypeface(null, Typeface.ITALIC); mValue.setGravity(Gravity.LEFT | Gravity.CENTER); mType.setText("111"); mValue.setText("111"); childLayout.addView(mValue, 0); childLayout.addView(mType, 0); linear.addView(childLayout); }
问题的出现的原因:无法将TextView添加到LinearLayout中。
解决方法:使用以下代码将TextView添加到LinearLayout中:
View linearLayout = findViewById(R.id.info); TextView valueTV = new TextView(this); valueTV.setText("hallo hallo"); valueTV.setId(5); valueTV.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); ((LinearLayout) linearLayout).addView(valueTV);
如果想要添加以下的TextView:
可以使用以下代码在按钮点击事件中添加TextView:
public void onClick(View v) { View linearLayout = findViewById(R.id.info); TextView textView = new TextView(this); textView.setId(R.id.tvDInfo3); textView.setLayoutParams(new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 1)); textView.setText("Release Date"); textView.setTextColor(Color.BLACK); textView.setTextSize(R.dimen.info_text_size); textView.setGravity(Gravity.CENTER); textView.setTypeface(null, Typeface.BOLD); linearLayout.addView(textView); }