質問編集履歴
1
コード
test
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File without changes
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test
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@@ -27,3 +27,119 @@
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どちらもエラーはでないのですが、失敗するコードは何故かボタンをおしたら落ちてしまいます
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全体コード↓
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46
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package com.example.practice;
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48
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51
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import androidx.appcompat.app.AlertDialog;
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52
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53
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import androidx.appcompat.app.AppCompatActivity;
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54
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import androidx.constraintlayout.widget.ConstraintLayout;
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56
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57
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58
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59
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import android.content.DialogInterface;
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60
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61
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import android.content.Intent;
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62
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63
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import android.graphics.Color;
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64
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65
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import android.os.Bundle;
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66
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67
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import android.view.KeyEvent;
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68
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69
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import android.view.MotionEvent;
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70
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71
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import android.view.View;
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72
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73
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import android.view.animation.AnimationUtils;
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74
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75
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import android.widget.EditText;
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76
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import android.widget.ImageView;
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78
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79
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import android.widget.RelativeLayout;
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80
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import android.widget.TextView;
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82
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import android.widget.Toast;
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84
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85
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86
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87
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import java.util.Random;
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88
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89
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90
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91
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public class MainActivity extends AppCompatActivity {
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92
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93
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94
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95
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96
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97
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@Override
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98
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99
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protected void onCreate(Bundle savedInstanceState) {
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100
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101
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super.onCreate(savedInstanceState);
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102
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103
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setContentView(R.layout.activity_main);
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104
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105
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106
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107
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new AlertDialog.Builder(this)
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108
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109
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.setTitle("背景色")
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110
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111
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.setMessage("背景色を変更しますか")
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112
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113
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.setPositiveButton("Yes",
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114
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115
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116
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new DialogInterface.OnClickListener() {
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118
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119
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@Override
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120
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121
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public void onClick(DialogInterface dialog, int which) {
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122
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123
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RelativeLayout layout = (RelativeLayout)findViewById(R.id.activity_main);
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124
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125
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layout.setBackgroundColor(Color.BLUE);
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126
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127
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128
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129
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130
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131
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}
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132
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133
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}
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134
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135
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)
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136
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137
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138
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139
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.setNegativeButton("No",null)
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140
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141
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.show();
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142
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143
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}
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144
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145
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}
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