老師逗比式學完了程序運行不了，
ListView listView = (ListView) findViewById(R.id.lv_main); listView.setAdapter(new MyAdapter(this,itemBeanList));第二句執行不了，報錯說什么空指針.....怎么解決
ylEcho
2017-06-06
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2017-06-06
ListView listView = (ListView) findViewById(R.id.lv_main);這句一定要放在在setContentView()語句之后執行,不然會返回空listView