本次安卓开发，我用了四个activity:
代码 MainActivity：
package com.example.demon; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.content.Intent; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity { private Button b1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); b1 = (Button) findViewById(R.id.button1); b1.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v){ Intent intent = new Intent(MainActivity.this,MainActivity1.class); startActivity(intent); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }
MainActivity1：
package com.example.demon; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class MainActivity1 extends Activity{ private Button b2; private Button b3; private EditText ed1,ed2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.xuanze); ed1 = (EditText) findViewById(R.id.editText1); ed2 = (EditText) findViewById(R.id.editText2); b2 = (Button) findViewById(R.id.button4); b3 = (Button) findViewById(R.id.button3); b2.setOnClickListener(new ButtonListener()); b3.setOnClickListener(new ButtonListener1()); } class ButtonListener implements OnClickListener { @Override public void onClick(View v){ Intent intent = new Intent(); intent.setClass(MainActivity1.this,MainActivity.class); MainActivity1.this.startActivity(intent); } } class ButtonListener1 implements OnClickListener { @Override public void onClick(View d){ Intent intent1 = new Intent(); String str1 = ed1.getText().toString(); String str2 = ed2.getText().toString(); if ((!"".equals(str1)) && (!"".equals(str2))) { // Intent的方法，现在把它理解成是一个Map就好了，Map.put(key,value); intent1.putExtra("num1", str1); intent1.putExtra("num2", str2); intent1.setClass(MainActivity1.this,MainActivity2.class); MainActivity1.this.startActivity(intent1); } } } }
MainActivity2：
package com.example.demon; import java.math.BigDecimal; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; public class MainActivity2 extends Activity { private Button b1; private Button b2; private Button b3; private Button b4; int z; private TextView t; private TextView txtview1; private EditText edtview1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main1); Intent fromPlusIntent = getIntent(); String num1Str = fromPlusIntent.getStringExtra("num1"); String num2Str = fromPlusIntent.getStringExtra("num2"); int num1 = Integer.parseInt(num2Str); z = num1; final int num2 = Integer.parseInt(num1Str); b1 = (Button) findViewById(R.id.button1); b2 = (Button) findViewById(R.id.button2); b3 = (Button) findViewById(R.id.button3); b4 = (Button) findViewById(R.id.button4); txtview1 = (TextView) findViewById(R.id.tv_2); edtview1 = (EditText) findViewById(R.id.editText1); // String str1 = edtview1.getText().toString(); // int num1 = Integer.parseInt(str1); b4.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { createf(num2); t = (TextView) findViewById(R.id.tv_1); t.setText(sty); } }); b3.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { createf(num2); t = (TextView) findViewById(R.id.tv_1); t.setText(sty); } }); t = (TextView) findViewById(R.id.tv_1); t.setText(sty); b1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(MainActivity2.this, MainActivity1.class); startActivity(intent); } }); // if (num1 == result) { b2.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { z = z-1; // 点击按钮后设置文字标签 String ansstring = edtview1.getText().toString(); // double num=Double.valueOf(ansstring); double num = Integer.valueOf(ansstring); String t = ""; int b = 0; if (num == f1) { t = "答对了，真棒"; b=b+1; } else { t = "答错了"; } Toast.makeText(MainActivity2.this, t, Toast.LENGTH_LONG) .show(); if(z==0) { Intent intent = new Intent(MainActivity2.this, MainActivity3.class); // intent.putExtra("num5", b); startActivity(intent); } } }); // } // if (num1 != result) { // b2.setOnClickListener(new OnClickListener() { // @Override // public void onClick(View v) { // // 点击按钮后设置文字标签 // // txtview1.setText("答错了"); // // 点击按钮后弹出提示框，里面的参数是（绑定活动，提示内容，显示时间） // Toast.makeText(MainActivity2.this, "答错了", Toast.LENGTH_LONG) // .show(); // // } // // }); // } } // // protected void onCreate1(Bundle savedInstanceState) { // super.onCreate(savedInstanceState); // setContentView(R.layout.activity_main1); // b2 = (Button) findViewById(R.id.button2); // createf(); // t=(TextView)findViewById(R.id.tv_1); // if(sty!=null) t.setText(sty); // // b2.setOnClickListener(new OnClickListener() { // // @Override // // public void onClick(View v) { // // Intent intent = new Intent(MainActivity2.this, // // MainActivity1.class); // // startActivity(intent); // // } // // }); // } String sty="zzzzz"; double result = 0; double f1; String k[]={"+","-","*","/"}; void createf(int num1) { double x = (int) (Math.random() * num1); double y = (int) (Math.random() * num1); double h = (int) (Math.random() * num1); int i = (int) ((Math.random() * num1)+3); int z = (int) (Math.random() * 4); int z1 = (int) (Math.random() * 4); if ( i == 2 ) { sty = x + k[z] + y; if(k[z]=="+") {result=x+y;} if(k[z]=="-") {result=x-y;} if(k[z]=="*") {result=x*y;} if(k[z]=="/") {result=x/y;} } if ( i == 3 ) { sty = x + k[z] + y +k[z1] + h; if(k[z]=="+") { if(k[z1]=="+") result = x + y + h ; if(k[z1]=="-") result = x + y - h ; if(k[z1]=="*") result = x + (y * h) ; if(k[z1]=="/") result = x +( y / h ); } if(k[z]=="-") { if(k[z1]=="+") result = x - y + h ; if(k[z1]=="-") result = x - y - h ; if(k[z1]=="*") result = x -( y * h) ; if(k[z1]=="/") result = x - (y / h) ; } if(k[z]=="*") { if(k[z1]=="+") result = (x * y) + h ; if(k[z1]=="-") result = (x * y) - h ; if(k[z1]=="*") result = (x * y) * h ; if(k[z1]=="/") result = (x * y) / h ; } if(k[z]=="/") { if(k[z1]=="+") result = (x / y) + h ; if(k[z1]=="-") result = (x / y) - h ; if(k[z1]=="*") result = (x / y) * h ; if(k[z1]=="/") result = (x / y) / h ; } } if ( i == 4 ) { int i1 = (int) (Math.random() * num1); if(k[z]=="+") { if(k[z1]=="+"){ if(i1==0){ sty = "("+x+k[z]+y+")"+k[z1]+z + "="; result = x + y + h ; } if(i1==1){ sty = x+k[z]+"("+y+k[z1]+z +")"+ "="; result = x + (y + h) ; } } if(k[z1]=="-") { if(i1==0){ sty = "("+x+k[z]+y+")"+k[z1]+z + "="; result = x + y - h ; } if(i1==1){ sty = x+k[z]+"("+y+k[z1]+z +")"+ "="; result = x + (y - h) ; } } if(k[z1]=="*") { if(i1==0){ sty = "("+x+k[z]+y+")"+k[z1]+z + "="; result = (x + y) * h ; } if(i1==1){ sty = x+k[z]+y+k[z1]+z + "="; result = x + (y * h) ; } } if(k[z1]=="/") { if(i1==0){ sty = "("+x+k[z]+y+")"+k[z1]+z + "="; result = (x + y) / h ; } if(i1==1){ sty = x+k[z]+y+k[z1]+z + "="; result = x + (y / h) ; } } } if(k[z]=="-") { if(k[z1]=="+") { if(i1==0){ sty = "("+x+k[z]+y+")"+k[z1]+z + "="; result = (x - y) * h ; } if(i1==1){ sty = x+k[z]+"("+y+k[z1]+z +")"+ "="; result = x - (y + h) ; } } if(k[z1]=="-") { if(i1==0){ sty = "("+x+k[z]+y+")"+k[z1]+z + "="; result = (x - y) - h ; } if(i1==1){ sty = x+k[z]+"("+y+k[z1]+z +")"+ "="; result = x - (y - h) ; } } if(k[z1]=="*") { if(i1==0){ sty = "("+x+k[z]+y+")"+k[z1]+z + "="; result = (x - y) * h ; } if(i1==1){ sty = x+k[z]+y+k[z1]+z + "="; result = x -( y * h) ; } } if(k[z1]=="/") { if(i1==0){ sty = "("+x+k[z]+y+")"+k[z1]+z + "="; result = (x - y) / h ; } if(i1==1){ sty = x+k[z]+y+k[z1]+z + "="; result = x - (y / h) ; } } } if(k[z]=="*") { if(k[z1]=="+") { if(i1==0){ sty = x+k[z]+y+k[z1]+z + "="; result = x * y + h ; } if(i1==1){ sty = x+k[z]+"("+y+k[z1]+z +")"+ "="; result = x * (y + h) ; } } if(k[z1]=="-") { if(i1==0){ sty = x+k[z]+y+k[z1]+z + "="; result = x * y + h ; } if(i1==1){ sty = x+k[z]+"("+y+k[z1]+z +")"+ "="; result = x * (y + h) ; } } if(k[z1]=="*") { if(i1==0){ sty = x+k[z]+y+k[z1]+z + "="; result = x * y * h ; } if(i1==1){ sty = x+k[z]+"("+y+k[z1]+z +")"+ "="; result = x * (y * h) ; } } if(k[z1]=="/") { if(i1==0){ sty = x+k[z]+y+k[z1]+z + "="; result = x * y / h ; } if(i1==1){ sty = x+k[z]+"("+y+k[z1]+z +")"+ "="; result = x * (y / h) ; } } } if(k[z]=="/") { if(k[z1]=="+") { if(i1==0){ sty = x+k[z]+y+k[z1]+z + "="; result = x / y + h ; } if(i1==1){ sty = x+k[z]+"("+y+k[z1]+z +")"+ "="; result = x / (y + h) ; } } if(k[z1]=="-") { if(i1==0){ sty = x+k[z]+y+k[z1]+z + "="; result = x / y - h ; } if(i1==1){ sty = x+k[z]+"("+y+k[z1]+z +")"+ "="; result = x / (y - h) ; } } if(k[z1]=="*") { if(i1==0){ sty = x+k[z]+y+k[z1]+z + "="; result = x / y * h ; } if(i1==1){ sty = x+k[z]+"("+y+k[z1]+z +")"+ "="; result = x / (y * h) ; } } if(k[z1]=="/") { if(i1==0){ sty = x+k[z]+y+k[z1]+z + "="; result = x / y / h ; } if(i1==1){ sty = x+k[z]+"("+y+k[z1]+z +")"+ "="; result = x / (y / h) ; } } } } BigDecimal bg = new BigDecimal(result); f1 = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue(); } // { // Button btn = (Button) findViewById(R.id.button3);// 获取按钮 // btn.setOnClickListener(new View.OnClickListener() { // 设置按钮单击事件 // @Override // public void onClick(View v) { // // TextView tv = (TextView) findViewById(R.id.editText2);// 获取textview组件 // // tv.setText(sty);// 在textview中显示 // } // }); // } }
MainActivity3：
package com.example.demon; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.content.Intent; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class MainActivity3 extends Activity{ private Button b1; private Button b2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); b1 = (Button) findViewById(R.id.button1); b2 = (Button) findViewById(R.id.button2); // Intent fromPlusIntent = getIntent(); // String num1Str = fromPlusIntent.getStringExtra("num5"); // int num2 = Integer.parseInt(num1Str); // TextView t = (TextView) findViewById(R.id.textView1); // t.setText(num2); b1.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v){ Intent intent = new Intent(MainActivity3.this,MainActivity1.class); startActivity(intent); } }); b2.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v){ Intent intent = new Intent(MainActivity3.this,MainActivity.class); startActivity(intent); } }); } }
开始界面：
出题界面：
答题界面：
返回界面：
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