Android简易计算器（破烂Alpha版，后续更新）
16lz
2021-01-23
Android简易计算器（破烂Alpha版，后续更新）
界面布局如下：
activity_main.xml
<LinearLayout 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:orientation="vertical" 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" > <TextView android:id="@+id/textView" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="right" android:background="#000000" android:textColor="#ffffff" android:textAppearance="?android:attr/textAppearanceLarge" /> <TableLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" > <TableRow android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/btn1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="1" /> <Button android:id="@+id/btn2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="2" /> <Button android:id="@+id/btn3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="3" /> <Button android:id="@+id/btnAdd" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="+" /> TableRow> <TableRow android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/btn4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="4" /> <Button android:id="@+id/btn5" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="5" /> <Button android:id="@+id/btn6" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="6" /> <Button android:id="@+id/btnSub" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="-" /> TableRow> <TableRow android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/btn7" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="7" /> <Button android:id="@+id/btn8" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="8" /> <Button android:id="@+id/btn9" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="9" /> <Button android:id="@+id/btnMul" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="*" /> TableRow> <TableRow android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/btnClear" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="C" /> <Button android:id="@+id/btn0" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="0" /> <Button android:id="@+id/btnResult" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="=" /> <Button android:id="@+id/btnDiv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="/" /> TableRow> TableLayout>LinearLayout>自定义操作资源类：
Type.java
public class Type { public static final int ADD = 1; public static final int SUB = 2; public static final int MUL = 3; public static final int DIV = 4; public static final int NUM = 5;}Item.java
public class Item { public Item(double value, int type) { this.value = value; this.type = type; } public double value = 0; public int type = 0;}主Activity类业务操作如下：
MainActivity.java
public class MainActivity extends Activity implements OnClickListener{ private TextView textView; private List- items = new ArrayList
- (); private boolean judgeClear = false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = (TextView) findViewById(R.id.textView); findViewById(R.id.btn0).setOnClickListener(this); findViewById(R.id.btn1).setOnClickListener(this); findViewById(R.id.btn2).setOnClickListener(this); findViewById(R.id.btn3).setOnClickListener(this); findViewById(R.id.btn4).setOnClickListener(this); findViewById(R.id.btn5).setOnClickListener(this); findViewById(R.id.btn6).setOnClickListener(this); findViewById(R.id.btn7).setOnClickListener(this); findViewById(R.id.btn8).setOnClickListener(this); findViewById(R.id.btn9).setOnClickListener(this); findViewById(R.id.btnAdd).setOnClickListener(this); findViewById(R.id.btnSub).setOnClickListener(this); findViewById(R.id.btnMul).setOnClickListener(this); findViewById(R.id.btnDiv).setOnClickListener(this); findViewById(R.id.btnResult).setOnClickListener(this); findViewById(R.id.btnClear).setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.btn0: if(judgeClear) { textView.setText(""); judgeClear = false; } textView.append("0"); break; case R.id.btn1: if(judgeClear) { textView.setText(""); judgeClear = false; } textView.append("1"); break; case R.id.btn2: if(judgeClear) { textView.setText(""); judgeClear = false; } textView.append("2"); break; case R.id.btn3: if(judgeClear) { textView.setText(""); judgeClear = false; } textView.append("3"); break; case R.id.btn4: if(judgeClear) { textView.setText(""); judgeClear = false; } textView.append("4"); break; case R.id.btn5: if(judgeClear) { textView.setText(""); judgeClear = false; } textView.append("5"); break; case R.id.btn6: if(judgeClear) { textView.setText(""); judgeClear = false; } textView.append("6"); break; case R.id.btn7: if(judgeClear) { textView.setText(""); judgeClear = false; } textView.append("7"); break; case R.id.btn8: if(judgeClear) { textView.setText(""); judgeClear = false; } textView.append("8"); break; case R.id.btn9: if(judgeClear) { textView.setText(""); judgeClear = false; } textView.append("9"); break; case R.id.btnAdd: items.add(new Item(Double.parseDouble(textView.getText().toString()), Type.NUM)); checkAndCompute(); items.add(new Item(0, Type.ADD)); textView.setText(""); break; case R.id.btnSub: items.add(new Item(Double.parseDouble(textView.getText().toString()), Type.NUM)); checkAndCompute(); items.add(new Item(0, Type.SUB)); textView.setText(""); break; case R.id.btnMul: items.add(new Item(Double.parseDouble(textView.getText().toString()), Type.NUM)); checkAndCompute(); items.add(new Item(0, Type.MUL)); textView.setText(""); break; case R.id.btnDiv: items.add(new Item(Double.parseDouble(textView.getText().toString()), Type.NUM)); checkAndCompute(); items.add(new Item(0, Type.DIV)); textView.setText(""); break; case R.id.btnResult: items.add(new Item(Double.parseDouble(textView.getText().toString()), Type.NUM)); checkAndCompute(); textView.setText(items.get(0).value + ""); items.clear(); judgeClear = true; break; case R.id.btnClear: textView.setText(""); items.clear(); judgeClear = false; break; } } public void checkAndCompute() { if(items.size() >= 3) { double a = items.get(0).value; double b = items.get(2).value; int opt = items.get(1).type; items.clear(); switch (opt) { case Type.ADD: items.add(new Item(a+b, Type.NUM)); break; case Type.SUB: items.add(new Item(a-b, Type.NUM)); break; case Type.MUL: items.add(new Item(a*b, Type.NUM)); break; case Type.DIV: items.add(new Item(a/b, Type.NUM)); break; } } }}
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