安卓第七週
阿新 • • 發佈:2021-10-07
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); } }); } }