Android handler常见api

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package com.example.a32_common_handler_api;import android.os.Handler;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.TextView;import java.util.Timer;import java.util.TimerTask;public class MainActivity extends AppCompatActivity {    private TextView tv;    private Timer timer;    private TimerTask task;    private static int i=0;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tv = (TextView) findViewById(R.id.tv);        //2000毫秒后 执行run方法  delay 延期//        new Handler().postDelayed(new Runnable() {//            @Override//            public void run() {//                tv.setText("哈哈");//            }//        }, 5000);        timer = new Timer();        task = new TimerTask() {            @Override            public void run() {                runOnUiThread(new Runnable() {                    @Override                    public void run() {                        String ii = i+"";                        tv.setText(ii); //这里之前报了一个错 注意！                        i++;                    }                });            }        };        //3秒后 每隔1秒执行一次run方法  period 周期        timer.schedule(task, 3000, 1000);    }    //当Activity销毁的时候 会执行这个方法    @Override    protected void onDestroy() {        timer.cancel();        task.cancel();        super.onDestroy();    }}

setText(i);报了一个错。找不到资源ID？

Do not concatenate text displayed with setText. Use resource string with placeholders. less... (Ctrl+F1)
When calling TextView#setText
* Never call Number#toString() to format numbers; it will not handle fraction separators and locale-specific digits properly. Consider using String#format with proper format specifications (%d or %f) instead.
* Do not pass a string literal (e.g. "Hello") to display text. Hardcoded text can not be properly translated to other languages. Consider using Android resource strings instead.
* Do not build messages by concatenating text chunks. Such messages can not be properly translated.

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