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安卓第七週

1.三個介面,介面1點選按鈕使用顯式意圖開啟介面2.
介面2點選按鈕隱式意圖開啟介面3

2.在介面1做一個按鈕開啟瀏覽器訪問百度

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); } }
package com.example.lj;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Log.e("MainActivity", "呼叫oncreate"); 複製程式碼 package com.example.lj; import android.app.Activity;
import android.os.Bundle; public class SecondActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); } } 複製程式碼 複製程式碼 <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="開啟介面三" /> </RelativeLayout> 複製程式碼 複製程式碼 <?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> 複製程式碼 } @Override protected void onStart() { // TODO Auto-generated method stub super.onStart(); Log.e("MainActivity", "呼叫onstart"); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); Log.e("MainActivity", "呼叫onresume"); } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); Log.e("MainActivity", "呼叫onpause"); } @Override protected void onStop() { // TODO Auto-generated method stub super.onStop(); Log.e("MainActivity", "呼叫onstop"); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); Log.e("MainActivity", "呼叫ondestroy"); } @Override protected void onRestart() { // TODO Auto-generated method stub super.onRestart(); Log.e("MainActivity", "呼叫onRestart"); } public void click1(View view){ Intent intent=new Intent(this,SecondActivity.class); startActivity(intent); } public void click2(View view){ Intent intent=new Intent(); intent.setAction("com.gd.activity2"); intent.addCategory("android.intent.category.DEFAULT"); startActivity(intent); } public void click3(View view){ Intent intent=new Intent(); intent.setAction("android.intent.action.VIEW"); intent.setData(Uri.parse("http://www.baidu.com")); startActivity(intent); } public void click4(View view){ Intent intent=new Intent(); intent.setAction("android.intent.action.VIEW"); intent.setData(Uri.parse("tel:123456")); startActivity(intent); } public void click5(View view){ Intent intent=new Intent(); intent.setAction("android.media.action.IMAGE_CAPTURE"); intent.addCategory("android.intent.category.DEFAULT"); startActivity(intent); } }

3.2個edittext,4個按鈕一個textview,實現簡單計算器。

提示1:如何獲取edittext上的資料?
String num1=((EditText)(findViewById(R.id.et1))).getText().toString();//獲取et1上面的文字,並
轉成字串
提示2:字串如何轉int
int n1=Integer.parseInt(num1);
提示3:如何把計算結果顯示在textview上?
TextView tv1=(TextView)findViewById(R.id.tv1);//獲取控制元件
tv1.setText("1233213");//用settext方法賦值

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"
    tools:context=".MainActivity" >
 
    <EditText
        android:id="@+id/et1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="請輸入第一個數"
        android:textSize="50dp"
        android:background="#32FF00"
        android:layout_marginBottom="100dp"
        />
 
    <EditText
        android:id="@+id/et2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="請輸入第二個數"
        android:textSize="50dp"
        android:background="#00FFF6"
        android:layout_below="@id/et1"
        android:layout_marginBottom="100dp"
        />
    <Button
        android:layout_below="@id/et2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/b1"
        android:text="+"
        android:textSize="50dp"
        android:textColor="#FF0000"
 
        />
    <Button
        android:layout_below="@id/et2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/b2"
        android:text="-"
        android:textSize="50dp"
        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:textSize="50dp"
        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:textSize="50dp"
        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="結果是"
        android:textSize="50dp"
        />
 
 
</RelativeLayout>
package com.example.mya;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class ThreeActivity extends AppCompatActivity {

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

        //加法運算
        findViewById(R.id.C1).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String num1=((EditText)(findViewById(R.id.B1))).getText().toString();
                String num2=((EditText)(findViewById(R.id.B2))).getText().toString();
                int n1=Integer.parseInt(num1);
                int n2=Integer.parseInt(num2);
                int n3=n1+n2;
                TextView jieguo=(TextView)findViewById(R.id.A2);
                jieguo.setText("計算結果是:"+n3);
            }
        });

        //減法運算
        findViewById(R.id.C2).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String num1=((EditText)(findViewById(R.id.B1))).getText().toString();
                String num2=((EditText)(findViewById(R.id.B2))).getText().toString();
                int n1=Integer.parseInt(num1);
                int n2=Integer.parseInt(num2);
                int n3=n1-n2;
                TextView jieguo=(TextView)findViewById(R.id.A2);
                jieguo.setText("計算結果是:"+n3);
            }
        });

        //乘法運算
        findViewById(R.id.C3).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String num1=((EditText)(findViewById(R.id.B1))).getText().toString();
                String num2=((EditText)(findViewById(R.id.B2))).getText().toString();
                int n1=Integer.parseInt(num1);
                int n2=Integer.parseInt(num2);
                int n3=n1*n2;
                TextView jieguo=(TextView)findViewById(R.id.A2);
                jieguo.setText("計算結果是:"+n3);
            }
        });

        //除法運算
        findViewById(R.id.C4).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String num1=((EditText)(findViewById(R.id.B1))).getText().toString();
                String num2=((EditText)(findViewById(R.id.B2))).getText().toString();
                int n1=Integer.parseInt(num1);
                int n2=Integer.parseInt(num2);
                int n3=n1/n2;
                TextView jieguo=(TextView)findViewById(R.id.A2);
                jieguo.setText("計算結果是:"+n3);
            }
        });

    }

}
 package com.example.myapplication;
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("結果是"+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("結果是"+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("結果是"+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("結果是"+n3);
            }
        });
    }
 
 
}