android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a v

来源：互联网发布：重返狼穴3mac怎么安装编辑：程序博客网时间：2024/06/05 15:58

public class MainActivity extends AppCompatActivity {    private Button mButton;    private TextView mTextView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButton = (Button) findViewById(R.id.btn_button);        mTextView = (TextView) findViewById(R.id.tv_show);        mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                new Thread(new Runnable() {                    @Override                    public void run() {                        mTextView.setText("1321456");                    }                }).start();            }        });    }}
这个代码表示不能在线程里边更新UI，
下面的代码展示更新UI  声明一个静态常量 ，新增了一个handle对象   重写handleMessage()
public static final int UPDATE_TEXT = 1;private Button mButton;private TextView mTextView;private Handler handle = new Handler(){    public void handleMessage(Message msg){        switch (msg.what){            case UPDATE_TEXT:                //在这里进行UI更新                mTextView.setText("123456");                break;            default:                break;        }    }};@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    mButton = (Button) findViewById(R.id.btn_button);    mTextView = (TextView) findViewById(R.id.tv_show);    mButton.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View view) {            new Thread(new Runnable() {                @Override                public void run() {                    Message message = new Message();                    message.what = UPDATE_TEXT;                    handle.sendMessage(message);                }            }).start();        }    });}

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