AndroidRuntime
来源:互联网 发布:星际老男孩淘宝店2016 编辑:程序博客网 时间:2024/04/30 03:52
代码:protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
bt_1 = (Button)findViewById(R.id.bt1);
editText = (EditText)findViewById(R.id.ed1);
setContentView(R.layout.first_layout);
bt_1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String dataString = editText.getText().toString();
Intent intent = new Intent(MainActivity.this, Second.class);
intent.putExtra("text", dataString);
startActivity(intent);
}
});
}
异常:Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
问题:布局未先加载,导致findViewById()结果为nullfindViewByIdfindViewById
findViewById
解决方法:将setContentView前置
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