Android的Log图文详解(Log.v,Log.d,Log.i,Log.w,Log.e)

/ >

< Button

android:id="@+id/bt"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Presse Me Look Log"

/ >

< /LinearLayout >

Step 4:设计主类LogDemo.java,代码如下:

package com.android.test;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

public class LogDemo extends Activity {

private static final String ACTIVITY_TAG="LogDemo";

private Button bt;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//通过findViewById找到Button资源

bt = (Button)findViewById(R.id.bt);

//增加事件响应

bt.setOnClickListener(new Button.OnClickListener(){

@Override

public void onClick(View v) {

Log.v(LogDemo.ACTIVITY_TAG, "This is Verbose.");

Log.d(LogDemo.ACTIVITY_TAG, "This is Debug.");

Log.i(LogDemo.ACTIVITY_TAG, "This is Information");

Log.w(LogDemo.ACTIVITY_TAG, "This is Warnning.");

Log.e(LogDemo.ACTIVITY_TAG, "This is Error.");

}

});

}

}

Step 5:运行LogDemo工程，效果如下:

当我们点击按钮时，会触发事件，在Logcat视窗下有如下效果: