任务1---打招呼

一、运行效果图

二、核心代码

package cn.edu.bzu.helloandroid;

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.Toast;

public class MainActivity extends Activity {
private Button btnClick;
private EditText etName;
private Toast toast;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

btnClick = (Button) findViewById(R.id.btnClick);
btnClick.setOnClickListener(new ClickHandler());

etName = (EditText) findViewById(R.id.etName);

}

class ClickHandler implements OnClickListener {

private static final int Gravity = 0;
private static final int CENTER = 0;

@Override
public void onClick(View view) {
String name = etName.getText().toString();
toast = Toast.makeText(MainActivity.this, "Hello " + name + " !",
Toast.LENGTH_LONG);

/*
* toast.setGravity(Gravity.CENTER, 0, 0); RelativeLayout toastView
* = (RelativeLayout) toast.getView(); ImageView imageCodeProject =
* new ImageView(getApplicationContext());
* imageCodeProject.setImageResource(R.drawable.smile);
* toastView.addView(imageCodeProject, 0); toast.show();
*/
toast.setGravity(Gravity, CENTER, 120);
ImageView imageview = new ImageView(getApplicationContext());
imageview.setImageResource(R.drawable.smile);
LinearLayout toastView = (LinearLayout) toast.getView();
toastView.setOrientation(LinearLayout.HORIZONTAL);
toastView.addView(imageview, 0);
toast.show();

}
}

}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bg" >

<EditText
android:id="@+id/etName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="45dp"
android:layout_marginTop="94dp"
android:background="@android:drawable/edit_text"
android:drawableLeft="@drawable/name"
android:ems="10"
android:hint="@string/etNamePrompt" >
<requestFocus />
</EditText>

<Button
android:id="@+id/btnClick"
android:layout_width="wrap_content"

4000
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/etName"
android:layout_below="@+id/etName"
android:layout_marginLeft="70dp"
android:layout_marginTop="30dp"
android:background="@drawable/btn_bg"
android:onClick="hello" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cn.edu.bzu.helloandroid"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="19" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity android:name="cn.edu.bzu.helloandroid.MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

三、程序出现的问题

对于带图片的toast的应用不熟悉，第一次写的代码没有运行出来，然后又经过查资料修改，总算是能运行了，从中总结了只要用心想去解决你遇到的问题就一定会解决的，通过出现的问题能学到很多东西，学习的过程正是一次次的不断出现问题又不断解决问题的过程。