第7周作业
1.三个界面,界面1点击按钮使用显式意图开启界面2.
界面2点击按钮隐式意图开启界面3
要求,按钮点击功能使用setOnclickListener方式
2.在界面1做一个按钮开启浏览器访问百度
package com.example.app6; import android.net.Uri; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button bt1=(Button)findViewById(R.id.bt1); Button bt2=(Button)findViewById(R.id.bt2); bt1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Intent intent=new Intent(MainActivity.this,Activity2.class); startActivity(intent); } }); } public void click2(View view){ Intent intent=new Intent(); intent.setAction("android.intent.action.VIEW"); intent.setData(Uri.parse("http://www.baidu.com")); startActivity(intent); } }
package com.example.app6; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class Activity2 extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_activity2); Button bt2=(Button)findViewById(R.id.bt2); bt2.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Intent intent=new Intent(); intent.setAction("com.lrp.start"); intent.addCategory("android.intent.category.DEFAULT"); startActivity(intent); } }); } }
package com.example.app6; import android.os.Bundle; import android.app.Activity; import android.view.Menu; public class Activity3 extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_activity3); } }
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <Button android:id="@+id/bt1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="开启界面二" /> <Button android:id="@+id/bt2" android:onClick="click2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="开启百度" android:layout_below="@id/bt1" /> </RelativeLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".Activity2" > <Button android:id="@+id/bt2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="开启界面三" /> </RelativeLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".Activity3" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> </RelativeLayout>
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.app6" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="17" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.app6.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="com.example.app6.Activity2" android:label="@string/title_activity_activity2" > </activity> <activity android:name="com.example.app6.Activity3" android:label="@string/title_activity_activity3" > <intent-filter> <action android:name="com.lrp.start" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </activity> </application> </manifest>
3.2个edittext,4个按钮 一个textview,实现简单计算器
提示1:如何获取edittext上的数据?
String num1=((EditText)(findViewById(R.id.et1))).getText().toString();//获取et1上面的文本,并转成字符串
提示2:字符串如何转int
int n1=Integer.parseInt(num1);
提示3:如何把计算结果显示在textview上?
TextView tv1=(TextView)findViewById(R.id.tv1);//获取控件
tv1.setText("1233213");//用settext方法赋值
package com.example.app7; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.widget.EditText; import android.widget.TextView; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // + findViewById(R.id.b1).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String num1=((EditText)(findViewById(R.id.et1))).getText().toString(); String num2=((EditText)(findViewById(R.id.et2))).getText().toString(); int n1=Integer.parseInt(num1); int n2=Integer.parseInt(num2); int n3=n1+n2; TextView tv1=(TextView)findViewById(R.id.tv); tv1.setText("结果是"+n3); } }); // - findViewById(R.id.b2).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String num1=((EditText)(findViewById(R.id.et1))).getText().toString(); String num2=((EditText)(findViewById(R.id.et2))).getText().toString(); int n1=Integer.parseInt(num1); int n2=Integer.parseInt(num2); int n3=n1-n2; TextView tv1=(TextView)findViewById(R.id.tv); tv1.setText("结果是"+n3); } }); // * findViewById(R.id.b3).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String num1=((EditText)(findViewById(R.id.et1))).getText().toString(); String num2=((EditText)(findViewById(R.id.et2))).getText().toString(); int n1=Integer.parseInt(num1); int n2=Integer.parseInt(num2); int n3=n1*n2; TextView tv1=(TextView)findViewById(R.id.tv); tv1.setText("结果是"+n3); } }); // / findViewById(R.id.b4).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String num1=((EditText)(findViewById(R.id.et1))).getText().toString(); String num2=((EditText)(findViewById(R.id.et2))).getText().toString(); int n1=Integer.parseInt(num1); int n2=Integer.parseInt(num2); int n3=n1/n2; TextView tv1=(TextView)findViewById(R.id.tv); tv1.setText("结果是"+n3); } }); } }
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <EditText android:id="@+id/et1" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入第一个数" /> <EditText android:id="@+id/et2" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="请输入第二个数" android:layout_below="@id/et1" /> <Button android:layout_below="@id/et2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/b1" android:text="+" /> <Button android:layout_below="@id/et2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/b2" android:text="-" android:layout_toRightOf="@id/b1" /> <Button android:layout_below="@id/et2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/b3" android:text="*" android:layout_toRightOf="@id/b2" /> <Button android:layout_below="@id/et2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/b4" android:text="/" android:layout_toRightOf="@id/b3" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv" android:layout_below="@id/b1" android:text="结果是" /> </RelativeLayout>